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High‐Speed Rail Feasibility Study Business Plan - Appendices

Transportation Economics & Management Systems, Inc (TEMS) ...

2010-03-01 | PDF

The appendices to the High-Speed Rail Feasibility Study provide the technical, institutional, and public-involvement documentation supporting the Rocky Mountain Rail Authority’s 2010 business plan. Organized in thirteen sections, they include RMRA membership by jurisdiction; the COMPASS™ travel-demand model; zone and socioeconomic data; stated-pref ...

03/30/2026

Title : High‐Speed Rail Feasibility Study Business Plan - Appendices Corporate Creator(s) : Transportation Economics & Management Systems, Inc (TEMS);Quandel Consultants, LLC;GBSM, Inc; Corporate Contributor(s) : Rocky Mountain Rail Authority Published Date : 2010-03-01 URL : https://rosap.ntl.bts.gov/view/dot/89748 Transportation Economics & Management Systems, Inc (TEMS) (2010). High‐Speed Rail Feasibility Study Business Plan - Appendices. Transportation Economics & Management Systems, Inc (TEMS) "High‐Speed Rail Feasibility Study Business Plan - Appendices" (2010) Transportation Economics & Management Systems, Inc (TEMS) "High‐Speed Rail Feasibility Study Business Plan - Appendices" , 2010 Export RIS Citation Information. TY - Tech Report A2 - Transportation Economics & Management Systems, Inc (TEMS) A2 - Quandel Consultants, LLC A2 - GBSM, Inc A3 - Rocky Mountain Rail Authority AB - The appendices to the High-Speed Rail Feasibility Study provide the technical, institutional, and public-involvement documentation supporting the Rocky Mountain Rail Authority’s 2010 business plan. Organized in thirteen sections, they include RMRA membership by jurisdiction; the COMPASS™ travel-demand model; zone and socioeconomic data; stated-preference survey instruments; detailed capital-cost schematics; regional unit-price and escalation analysis; rail tunnel evaluation; I-70 grade comparisons; a Colorado Springs alignment option; AGS technology performance criteria; an assessment of novel technologies; train schedules for the FRA Developed Option; and documentation of the public involvement process. AB - A substantial portion of the appendix volume documents the study’s analytical framework. The COMPASS™ model is presented as a multimodal forecasting system calibrated for business, commuter, tourist, and social trips, with separate treatment of long- and short-distance travel and incremental “pivot point” forecasting used to preserve observed travel patterns. The appendices also supply the underlying zone system, socioeconomic inputs, and survey forms used to estimate values of time, frequency, reliability, and modal choice behavior. The engineering and alternatives appendices expand the study’s treatment of infrastructure cost and route performance. They include detailed segment-level capital-cost schematics, unit-price assumptions, tunnel evaluation, I-70 4 percent versus 7 percent grade comparisons, and a possible Colorado Springs alignment variation. In the I-70 analysis, the appendices emphasize that the purpose of the study was to identify feasible alternatives for future NEPA review rather than to select a final optimal route or technology, and they conclude that either the Pando or Vail Pass alternatives could remain under consideration. AB - The appendices also address technology screening and implementation support. They include I-70 Coalition performance criteria for AGS concepts, a critique of “novel” or low-cost-guideway technologies, schedules for the FRA Developed Option, and documentation of corridor workshops and stakeholder consultation. In its discussion of novel technologies, the appendix states that both the I-70 PEIS and the RMRA business plan found rail less expensive than maglev while offering similar performance, reinforcing the report’s emphasis on feasible rather than speculative solutions. AB - Cite as: Transportation Economics & Management Systems, Inc., Quandel Consultants, LLC, & GBSM, Inc. (2010, March). High-speed rail feasibility study: Business plan—Appendices. Rocky Mountain Rail Authority. AN - dot:89748 KW - High speed rail KW - Feasibility analysis KW - Business models KW - Rail transit LA - English PB - Rocky Mountain Rail Authority PY - 2010-03-01 TI - High‐Speed Rail Feasibility Study Business Plan - Appendices M3 - Tech Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89748 ER -
Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging

Kondyli, Alexandra

;

Schrock, Steven D.

2026-03-01 | PDF

Successful transportation safety messages are only effective if travelers can comprehend the notices. However, one method of safety messaging, text-only messages, can be challenging for non-native English speakers and slow-reading populations, such as older adults. The addition of graphics can potentially improve message comprehension, but their ef ...

03/30/2026

Title : Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging Creator(s) : Kondyli, Alexandra;Schrock, Steven D.;Mahajan, Kirti;Masud, Saumik Sakib Bin;Karki, Aayush Maan;Shrestha, Saurav;Tabatabaei, Mahgam; Corporate Creator(s) : University of Kansas. Transportation Center;K-TRAN (Research program); Corporate Contributor(s) : Kansas. Dept. of Transportation. Bureau of Research Published Date : 2026-03-01 Report Number : K-TRAN: KU-24-3 URL : https://rosap.ntl.bts.gov/view/dot/89747 Kondyli, Alexandra et al. (2026). Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging. Kondyli, Alexandra et al. "Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging" (2026) Kondyli, Alexandra et al. "Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging" , 2026 Export RIS Citation Information. TY - Tech Report AU - Kondyli, Alexandra AU - Schrock, Steven D. AU - Mahajan, Kirti AU - Masud, Saumik Sakib Bin AU - Karki, Aayush Maan AU - Shrestha, Saurav AU - Tabatabaei, Mahgam A2 - University of Kansas. Transportation Center A2 - K-TRAN (Research program) A3 - Kansas. Dept. of Transportation. Bureau of Research AB - Successful transportation safety messages are only effective if travelers can comprehend the notices. However, one method of safety messaging, text-only messages, can be challenging for non-native English speakers and slow-reading populations, such as older adults. The addition of graphics can potentially improve message comprehension, but their effectiveness compared to text-only messaging campaigns is uncertain. This study evaluated the role of graphics, both with and without text, in enhancing comprehension and the effectiveness of dynamic message signs (DMS), with attention to demographic factors. Results showed that signs with graphics and text consistently outperformed graphics-only signs across all measures, including conspicuity, comprehension, ease of use, intention to comply, and memorability. The lowest-scoring signs lacked text, leading to poor interpretation accuracy and compliance. Statistical analyses confirmed that text significantly improved message effectiveness by reducing comprehension gaps between native and non-native English speakers. Age also influenced performance, with drivers older than 41 years old demonstrating higher effectiveness scores, likely due to driving experience. Logistic regression showed that age, literacy rate, and text presence positively predicted accurate sign interpretation. The findings indicate that graphics alone are insufficient for effective DMS communication, although pairing graphics with text enhances comprehension and compliance for all populations, especially for non-native speakers and young drivers. Awareness initiatives are recommended to improve familiarity with graphic signs. AN - dot:89747 ET - Final Report: July 2023 – October 2025 KW - Variable message signs KW - Visibility KW - Comprehension KW - Logistic regression analysis KW - Graphics KW - Drivers KW - Statistical analysis KW - Evaluation KW - Travelers KW - Memorability LA - English PB - Kansas. Department of Transportation. Bureau of Materials and Research PY - 2026-03-01 SN - K-TRAN: KU-24-3 TI - Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging M3 - Tech Report N1 - United States N1 - C2230 UR - https://rosap.ntl.bts.gov/view/dot/89747 ER -
Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]

Kondyli, Alexandra

;

Schrock, Steven D.

2026-03-01 | PDF

Successful transportation messages are only effective if travelers can read and comprehend the message. However, text-based messages can be challenging for non-native English speakers or slow-reading populations, such as the elderly. The addition of graphics messages as a potential aid to improve message comprehension is uncertain, as is their effe ...

03/30/2026

Title : Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary] Creator(s) : Kondyli, Alexandra;Schrock, Steven D.;Mahajan, Kirti;Masud, Saumik Sakib Bin;Karki, Aayush Maan;Shrestha, Saurav;Tabatabaei, Mahgam; Corporate Creator(s) : University of Kansas Corporate Contributor(s) : Kansas. Department of Transportation. Bureau of Materials and Research Published Date : 2026-03-01 Report Number : KU-24-3 URL : https://rosap.ntl.bts.gov/view/dot/89746 Kondyli, Alexandra et al. (2026). Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]. Kondyli, Alexandra et al. "Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]" (2026) Kondyli, Alexandra et al. "Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]" , 2026 Export RIS Citation Information. TY - Brief AU - Kondyli, Alexandra AU - Schrock, Steven D. AU - Mahajan, Kirti AU - Masud, Saumik Sakib Bin AU - Karki, Aayush Maan AU - Shrestha, Saurav AU - Tabatabaei, Mahgam A2 - University of Kansas A3 - Kansas. Department of Transportation. Bureau of Materials and Research AB - Successful transportation messages are only effective if travelers can read and comprehend the message. However, text-based messages can be challenging for non-native English speakers or slow-reading populations, such as the elderly. The addition of graphics messages as a potential aid to improve message comprehension is uncertain, as is their effectiveness compared to text-only messaging campaigns. Current literature reviews have focused on the use of graphical shields and highway signs for messaging, but research is needed to analyze the effectiveness of graphics for conveying safety messages without explanatory text and evaluate whether this approach could be beneficial for specific populations. The objectives of this project were to determine whether graphics can be used to enhance comprehension and effectiveness of messaging, and to help guide development of guidelines to determine when and how the graphics, either stand-alone or supplemental to text, can be used to enhance the comprehension and effectiveness of key safety messages. AN - dot:89746 ET - Technical Summary KW - Variable message signs KW - Visibility KW - Comprehension KW - Logistic regression analysis KW - Drivers KW - Statistical analysis KW - Evaluation KW - Travelers KW - Literature reviews KW - Memorability LA - English PB - Kansas. Department of Transportation. Bureau of Materials and Research PY - 2026-03-01 SN - KU-24-3 TI - Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary] M3 - Brief N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89746 ER -
Implementing the Safe System Approach for Speed Management in Utah

Schultz, Grant G. ;

Tripp, Kezia I.

2026-02-01 | PDF

Speed management is central to reducing fatal and serious injury crashes. The Safe System Approach, an emerging roadway safety paradigm in the United States, recognizes human error and vulnerability and focuses on minimizing crash severity through coordinated policy, design, and operational strategies. This research examines how Safe System Approac ...

03/30/2026

Title : Implementing the Safe System Approach for Speed Management in Utah Creator(s) : Schultz, Grant G.;Tripp, Kezia I.;Goss, Abbie L.; Corporate Creator(s) : Brigham Young University. Department of Civil and Construction Engineering Corporate Contributor(s) : Utah. Department of Transportation. Research and Innovation Division;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-02-01 Report Number : UT-26.01 URL : https://rosap.ntl.bts.gov/view/dot/89745 Schultz, Grant G. et al. (2026). Implementing the Safe System Approach for Speed Management in Utah. Schultz, Grant G. and Tripp, Kezia I. and Goss, Abbie L. "Implementing the Safe System Approach for Speed Management in Utah" (2026) Schultz, Grant G. et al. "Implementing the Safe System Approach for Speed Management in Utah" , 2026 Export RIS Citation Information. TY - Tech Report AU - Schultz, Grant G. AU - Tripp, Kezia I. AU - Goss, Abbie L. A2 - Brigham Young University. Department of Civil and Construction Engineering A3 - Utah. Department of Transportation. Research and Innovation Division A3 - United States. Department of Transportation. Federal Highway Administration AB - Speed management is central to reducing fatal and serious injury crashes. The Safe System Approach, an emerging roadway safety paradigm in the United States, recognizes human error and vulnerability and focuses on minimizing crash severity through coordinated policy, design, and operational strategies. This research examines how Safe System Approach principles can be applied to speed management, with a focus on identifying practical countermeasures and implementation strategies relevant to the Utah Department of Transportation (UDOT). A compendium of practice was conducted to evaluate speed management countermeasures and document how cities and state Departments of Transportation are implementing Safe System Approach-based strategies. Thirty-two countermeasures were identified, including policy-based programs, automated enforcement, and roadway design treatments such as road diets, roundabouts, curb extensions, and gateway features. Findings show that implementing multiple, coordinated strategies is more effective than isolated interventions. The use of high-quality, context-sensitive speed and safety data supports proactive alignment of speed limits, roadway design, and safety goals. Establishing a clear Safe System Approach vision, supported by available federal and state tools, provides agencies with clear guidance for implementation. Based on the results of this research, several recommendations were provided for UDOT, including continuing to implement countermeasures for speed management in speed limit setting policies, evaluating current policies related to speed safety cameras in the state, incorporating Safe System Approach practices in the Strategic Highway Safety Plan, creating a speed management action plan, and placing a strong emphasis on community education tied to speed management. AN - dot:89745 ET - Final Report: Oct 2024 to Feb 2026 KW - Fail safe systems KW - Safety engineering KW - Speed control KW - Transportation safety KW - Implementation KW - Countermeasures KW - Data analysis KW - Crash injuries KW - Fatalities KW - Safe system approach KW - safe system for speed management KW - speed management LA - English PB - Utah Department of Transportation PY - 2026-02-01 SN - UT-26.01 TI - Implementing the Safe System Approach for Speed Management in Utah M3 - Tech Report N1 - United States N1 - 25-8516 UR - https://rosap.ntl.bts.gov/view/dot/89745 ER -
Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways

Figulus, Jens

;

Lawrence, Aaron

2026-03-23 | PDF

Shallow-bay ports and waterways in bay systems along the Gulf Coast of America are critical transportation infrastructure and the Nation’s economic drivers. Vessel propeller wash is the water movement induced by the forces generated from propeller rotation as vessels transit shipping channels. It has the potential to suspend sediment that can then ...

03/30/2026

Title : Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways Creator(s) : Figulus, Jens;Lawrence, Aaron;Gombac, Andrew;Kulesza, Stacey; Corporate Creator(s) : Texas A&M University;Texas State University--San Marcos;CREATE - Coastal REsearch And Transportation Education; Corporate Contributor(s) : United States. Department of Transportation. University Transportation Centers (UTC) Program;United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology; Published Date : 2026-03-23 Report Number : 2301-8 URL : https://rosap.ntl.bts.gov/view/dot/89744 Figulus, Jens et al. (2026). Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways. Figulus, Jens et al. "Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways" (2026) Figulus, Jens et al. "Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways" , 2026 Export RIS Citation Information. TY - Tech Report AU - Figulus, Jens AU - Lawrence, Aaron AU - Gombac, Andrew AU - Kulesza, Stacey A2 - Texas A&M University A2 - Texas State University--San Marcos A2 - CREATE - Coastal REsearch And Transportation Education A3 - United States. Department of Transportation. University Transportation Centers (UTC) Program A3 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology AB - Shallow-bay ports and waterways in bay systems along the Gulf Coast of America are critical transportation infrastructure and the Nation’s economic drivers. Vessel propeller wash is the water movement induced by the forces generated from propeller rotation as vessels transit shipping channels. It has the potential to suspend sediment that can then be transported throughout the system, leading to potential sedimentation issues. In this study, field measurements using a vessel-mounted Acoustic Doppler Current Profiler (ADCP)and echo sounder system were conducted in the Houston Ship Channel (HSC) in Galveston Bay, Texas, by traversing the HSC back and forth with a survey vessel immediately after passage of a large ship. The obtained high-resolution 3D velocity and acoustic amplitude return values were processed to quantify suspended sediment concentration (SSC) and suspended sediment flux throughout the water column for around 80 different vessels transiting the HSC. Results indicate that vessel-induced SSC in the ship channel and along the slopes can reach values around 1 g/L, two orders of magnitude larger than back ground concentrations. Furthermore, suspended sediment fluxes close to 200 g/s perpendicular to the channel axis have been estimated from the field measurements. Simultaneous electrical resistivity measurements via an instrumented tow cable were used to test another measuring technique to assess suspended sediment concentration in the water column caused by large vessels. Although the signals were too small to image the SSC, the average electrical resistivity within the HSC was significantly different when vessels were and were not present in the same locations. Similarly, the electrical resistivity was not significantly different when two transects with vessels were compared or two transects without. Thus, the electrical resistivity data provide further evidence that the vessels induce SSC in the ship channel. The quantifications of SSC and flux and statistical significance of electrical resistivity differences highlight the importance of propeller wash contributions to persistent shoaling issues in the HSC and provide an opportunity to further develop prediction tools for sediment movement and management guidelines on how to mitigate siltation in our Nation’s waterways. AN - dot:89744 ET - Final Project Report January 29, 2026 KW - Ships KW - Acoustics KW - Doppler navigation KW - Resistivity method KW - Suspended sediments KW - Ports KW - Waterways KW - Vessel operations KW - Sedimentation KW - Ship Channel Shoaling KW - Field Measurements KW - Doppler Current Profiler KW - Resistivity Probe KW - Galveston Bay Texas KW - Houston Ship Channel LA - English PB - CREATE - Coastal REsearch And Transportation Education PY - 2026-03-23 SN - 2301-8 TI - Quantifying Vessel Propeller Wash Impacts on Sedimentation in Shallow-Bay Ports and Waterways M3 - Tech Report N1 - United States N1 - 69A3552348330 UR - https://rosap.ntl.bts.gov/view/dot/89744 ER -
Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee

Onyango, Mbakisya ;

Fomunung, Ignatius

2025-09-01 | PDF

Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement secti ...

03/30/2026

Title : Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee Creator(s) : Onyango, Mbakisya;Fomunung, Ignatius;Bathi, Jejal Reddy;Owino, Joseph;Liang, Yu;Otieno, Maxine;Vanga, Maneesha; Corporate Creator(s) : University of Tennessee at Chattanooga Corporate Contributor(s) : Tennessee. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-09-01 Report Number : RES 2023-11 URL : https://rosap.ntl.bts.gov/view/dot/89743 Onyango, Mbakisya et al. (2025). Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee. Onyango, Mbakisya et al. "Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee" (2025) Onyango, Mbakisya et al. "Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee" , 2025 Export RIS Citation Information. TY - Tech Report AU - Onyango, Mbakisya AU - Fomunung, Ignatius AU - Bathi, Jejal Reddy AU - Owino, Joseph AU - Liang, Yu AU - Otieno, Maxine AU - Vanga, Maneesha A2 - University of Tennessee at Chattanooga A3 - Tennessee. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement sections in Tennessee using historical MERRA climate data (or baseline) and machine learning projected climate scenarios. Results showed that pavement sections of the baseline scenario performed at an acceptable level to the end of design period. Climate data projections used machine learning models to predict five climate inputs: temperature, wind speed, percent sunshine, precipitation, and humidity from 2024 to 2044. NeuralProphet and LSTM models were selected for the study. However, the models did not capture peak temperatures accurately. A hybrid model, based on a Variational Autoencoder (VAE) with LSTM layers, gave more accurate results capturing peak temperatures. The VAE compressed the large climate dataset into a smaller representation to capture seasonal and temporal patterns, and the LSTM encoder learned the sequential climate data and reconstructed the values while keeping these critical weather patterns. Comparative analysis between historical and projected climate data files indicated that the projected climate data predicted distresses that were higher than historical climate data; however, the difference was not statistically significant and did not exceed the distress threshold at the end of design period. This indicates that there is no immediate need to change design and maintenance parameters for Tennessee, but close monitoring of weather events and improving severely distressed sections may be required. Moreover, historical climate data can still be successfully used to design pavements. Tennessee maintenance data showed a state average PSI of 3.35 and strong negative correlation of 68% between PSI and IRI, meaning PSI decreases with increase in IRI. AN - dot:89743 ET - Final Report: September 2025 KW - Climate change KW - Forecasting KW - Machine learning KW - Pavement performance KW - Data collection KW - Temperature KW - Infrastructure KW - Maintenance KW - Alternatives analysis KW - Transportation departments KW - AASHTOWare PMED LA - English PB - Tennessee. Department of Transportation PY - 2025-09-01 SN - RES 2023-11 TI - Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee M3 - Tech Report N1 - United States N1 - RES 2023-11 UR - https://rosap.ntl.bts.gov/view/dot/89743 ER -
Evaluation of Backfill Aggregate Properties

Alshibli, Khalid A. ;

Elkenawi, Mohamed

2026-03-01 | PDF

Open-graded granular backfill materials are widely used as retaining wall backfill due to their high shear strength, high permeability, ease to handle, and compaction characteristics. However, the current Tennessee Department of Transportation (TDOT) provisions assume a conservative angle of internal friction for backfill materials. The objective o ...

03/30/2026

Title : Evaluation of Backfill Aggregate Properties Creator(s) : Alshibli, Khalid A.;Elkenawi, Mohamed; Corporate Creator(s) : University of Tennessee, Knoxville Corporate Contributor(s) : Tennessee. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-03-01 Report Number : RES2024-05 URL : https://rosap.ntl.bts.gov/view/dot/89742 Alshibli, Khalid A. and Elkenawi, Mohamed (2026). Evaluation of Backfill Aggregate Properties. Alshibli, Khalid A. and Elkenawi, Mohamed "Evaluation of Backfill Aggregate Properties" (2026) Alshibli, Khalid A. and Elkenawi, Mohamed "Evaluation of Backfill Aggregate Properties" , 2026 Export RIS Citation Information. TY - Tech Report AU - Alshibli, Khalid A. AU - Elkenawi, Mohamed A2 - University of Tennessee, Knoxville A3 - Tennessee. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Open-graded granular backfill materials are widely used as retaining wall backfill due to their high shear strength, high permeability, ease to handle, and compaction characteristics. However, the current Tennessee Department of Transportation (TDOT) provisions assume a conservative angle of internal friction for backfill materials. The objective of this project was to assess the influence of mineralogy, morphology, and aggregate type on the density and shear strength of fill aggregates from a wide range of supply sources throughout Tennessee. A comprehensive testing program was conducted employing a special large-scale direct shear apparatus to test twenty-six coarse aggregates conforming to the #57 stone gradation, including crushed limestone and river gravel at normal stresses of 35, 70, 105, and 140 kPa and relative densities of 30% and 80%. Particle morphology was quantified using 3D X-ray micro-computed tomography (μCT), enabling the extraction of statistically robust descriptors of roundness, form, and sphericity. The results demonstrate that specific morphology parameters, particularly sphericity location, roundness scale, and form scale, have a measurable and consistent influence on the peak friction angle (ϕp), critical state friction angle (ϕcs), and dilatancy angle (ψ), regardless of the particle size and material origin (mineralogy). Incorporating the 3D morphological indices into linear and nonlinear regression models significantly improved the prediction of ϕp, ϕcs, and ψ across a broad range of granular materials. This report recommends new friction and dilatancy angles for backfill materials depending on the height of the retaining wall and proposes revising current TDOT SP624 provisions for backfill materials compaction and subsequently the backfill zone behind the retaining walls. The percentage reduction in the volume of backfill aggregates for the proposed guidelines is between 24% and 66% depending on the height of the wall and the thickness of its footing. AN - dot:89742 ET - Final Report (8/1/23-3/31/26) KW - Shear strength KW - Aggregates KW - Friction factor KW - Retaining walls KW - Shear strain KW - Open graded aggregates KW - Granular soils KW - Backfill soils KW - Evaluation KW - Soils by properties KW - Friction angle KW - wall backfill LA - English PB - Tennessee. Department of Transportation PY - 2026-03-01 SN - RES2024-05 TI - Evaluation of Backfill Aggregate Properties M3 - Tech Report N1 - United States N1 - 74736 UR - https://rosap.ntl.bts.gov/view/dot/89742 ER -
Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary

Yin, Fan ;

Hajj, Elie Y

2024-12-01 | PDF

On September 24–25, 2024, seven lead States gathered for a peer exchange in Chesterfield, Missouri, and discussed their activities in advancing Balanced Mix Design (BMD) implementation. The peer exchange was sponsored by the Federal Highway Administration (FHWA). The peer exchange provided an opportunity for lead States to share their implementatio ...

03/30/2026

Title : Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary Creator(s) : Yin, Fan;Hajj, Elie Y;Aschenbrener, Tim;Harman, Thomas;Nener-Plante, Derek; Corporate Creator(s) : University of Nevada, Reno. Department of Civil and Environmental Engineering Corporate Contributor(s) : United States. Federal Highway Administration. Office of Preconstruction, Construction, and Pavements Published Date : 2024-12-01 Report Number : FHWA-HIF-25-007 URL : https://rosap.ntl.bts.gov/view/dot/89741 Yin, Fan et al. (2024). Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary. Yin, Fan et al. "Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary" (2024) Yin, Fan et al. "Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary" , 2024 Export RIS Citation Information. TY - Tech Report AU - Yin, Fan AU - Hajj, Elie Y AU - Aschenbrener, Tim AU - Harman, Thomas AU - Nener-Plante, Derek A2 - University of Nevada, Reno. Department of Civil and Environmental Engineering A3 - United States. Federal Highway Administration. Office of Preconstruction, Construction, and Pavements A4 - Aschenbrener, Timothy B. AB - On September 24–25, 2024, seven lead States gathered for a peer exchange in Chesterfield, Missouri, and discussed their activities in advancing Balanced Mix Design (BMD) implementation. The peer exchange was sponsored by the Federal Highway Administration (FHWA). The peer exchange provided an opportunity for lead States to share their implementation status, lessons learned, and challenges encountered. The State participants also explored strategies to further enhance BMD adoption. This report summarizes key discussions of selected topics and highlights major outcomes of the peer exchange, including main takeaways, effective practices, and critical challenges identified by the lead States for implementing BMD. AN - dot:89741 KW - Mix design KW - Pavement performance KW - Mechanical tests KW - Pavement distress KW - Implementation LA - English PB - United States. Federal Highway Administration. Office of Preconstruction, Construction, and Pavements PY - 2024-12-01 SN - FHWA-HIF-25-007 TI - Lead States Balanced Mix Design (BMD) Peer Exchange: Outcomes Summary M3 - Tech Report N1 - United States N1 - 693JJ32350026 N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89741 ER -
Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures

Morris, Philip J. ;

Hansman, R. John

2016-08-01 | PDF

Noise analysis is one important component of environmental evaluation for new flight procedure design. Communities, airports, regulators. Currently, the Aviation Environmental Design Tool (AEDT) is the primary tools used to evaluate new procedures and traffic intensity levels for calculating noise impact footprints near airports. AEDT noise calcula ...

03/30/2026

Title : Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures Creator(s) : Morris, Philip J.;Hansman, R. John;Sparrow, Victor W.;Botre, Mrunali;Yutko, Brian;Jensen, Luke;Thomas, Jaqueline;Brooks, Cal;Salgueiro, Sandro;Brenner, Morrisa; Corporate Creator(s) : Pennsylvania State University. Department of Aerospace Engineering;Massachusetts Institute of Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment Published Date : 2016-08-01 URL : https://rosap.ntl.bts.gov/view/dot/89740 Morris, Philip J. et al. (2016). Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures. Morris, Philip J. et al. "Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures" (2016) Morris, Philip J. et al. "Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures" , 2016 Export RIS Citation Information. TY - Tech Report AU - Morris, Philip J. AU - Hansman, R. John AU - Sparrow, Victor W. AU - Botre, Mrunali AU - Yutko, Brian AU - Jensen, Luke AU - Thomas, Jaqueline AU - Brooks, Cal AU - Salgueiro, Sandro AU - Brenner, Morrisa A2 - Pennsylvania State University. Department of Aerospace Engineering A2 - Massachusetts Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment AB - Noise analysis is one important component of environmental evaluation for new flight procedure design. Communities, airports, regulators. Currently, the Aviation Environmental Design Tool (AEDT) is the primary tools used to evaluate new procedures and traffic intensity levels for calculating noise impact footprints near airports. AEDT noise calculations use Noise-Power-Distance (NPD) interpolation to calculate noise using engine data generated through flight test and/or analysis. This procedure results in a simple and computationally tractable noise estimation capability for engine noise sources only. Aerodynamic and procedural noise contributions are not fully incorporated into the model. This project involved a collaborative effort involving Penn State University and the Massachusetts Institute of Technology. Penn State had the responsibility to assess the quality of noise predictions made by existing aircraft noise prediction codes. This project involved a collaborative effort involving Penn State University and the Massachusetts Institute of Technology. MIT had responsibility for noise predictions made by existing aircraft noise prediction codes. Both engine noise and airframe noise were examined using different modules in ANOPP. Differences between predictions from different models were quantified. For example, there were noticeable differences between different noise models for landing gear noise that ranged from the simplest, involving no geometric detail, and the models that allowed inclusion of considerable geometric details to be input. AN - dot:89740 ET - Final Report KW - Aircraft noise KW - Calibration KW - Aerodynamic noise KW - Environmental impact analysis KW - Operations research LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2016-08-01 TI - Project 23 Analytical Approach for Qualifying Noise from Advanced Operational Procedures M3 - Tech Report N1 - United States N1 - 13-C-AJFE-PSU-018 UR - https://rosap.ntl.bts.gov/view/dot/89740 ER -
Advancing Nighttime Work Zone Safety

United States. Department of Transportation. Federal Highway Administration

2026-02-23 | PDF

Nighttime work zones create extra challenges for transportation agencies, highway workers, and drivers. As agencies shift more work (construction, maintenance, utility) to nighttime to reduce daytime delays, and with more highway workers on the job than in previous years, safety risks for nighttime crews have increased. In 2023, approximately half ...

03/30/2026

Title : Advancing Nighttime Work Zone Safety Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Federal Highway Administration. Center for Accelerating Innovation Contributor(s) : Kapitanov, Martha;Paracha, Jawad; Published Date : 2026-02-23 Report Number : FHWA-26-CAI-006 URL : https://rosap.ntl.bts.gov/view/dot/89739 United States. Department of Transportation. Federal Highway Administration (2026). Advancing Nighttime Work Zone Safety. United States. Department of Transportation. Federal Highway Administration "Advancing Nighttime Work Zone Safety" (2026) United States. Department of Transportation. Federal Highway Administration "Advancing Nighttime Work Zone Safety" , 2026 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Federal Highway Administration. Center for Accelerating Innovation A4 - Kapitanov, Martha A4 - Paracha, Jawad AB - Nighttime work zones create extra challenges for transportation agencies, highway workers, and drivers. As agencies shift more work (construction, maintenance, utility) to nighttime to reduce daytime delays, and with more highway workers on the job than in previous years, safety risks for nighttime crews have increased. In 2023, approximately half of all fatal work zone crashes occurred at night. Nighttime fatigue or impairment in drivers raises the chances of vehicles entering work zones, and lighter traffic volumes can lead to higher speeds, a factor in more than 30% of fatal work zone crashes in 2023. Through the Advancing Nighttime Work Zone Safety initiative, FHWA is helping agencies transform high-hazard work zones into safe, predictable, and efficient workspaces by standardizing how to light and protect them using innovative and effective strategies. AN - dot:89739 KW - Work zone safety KW - Nighttime crashes KW - Traffic safety KW - Work zones LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2026-02-23 SN - FHWA-26-CAI-006 TI - Advancing Nighttime Work Zone Safety M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89739 ER -
Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep

Basner, Mathias

;

Smith, Michael G.

2026-02-01 | PDF

Nighttime environmental noise (EN) exposure disturbs sleep and increases morbidity and mortality. Affordable and effective countermeasures are needed, but rigorous research is scarce. This study investigates the efficacy of pink noise (PN) and earplugs for mitigating the effects of intermittent EN on sleep.

03/30/2026

Title : Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep Creator(s) : Basner, Mathias;Smith, Michael G.;Cordoza, Makayla;Kayser, Matthew S.;Carlin, Michele;Ecker, Adrian J.;Gilad, Yoni;Park-Chavar, Sierra;Rennie, Ka’alana;Schneller, Victoria;Walsh, Sinead;Shou, Haochang;Cao, Quy;Younes, Magdy;Aeschbach, Daniel;Jones, Christopher W.; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;University of Pennsylvania; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2026-02-01 Report Number : sag001 DOI : https://doi.org/10.1093/sleep/zsag001 Basner, Mathias et al. (2026). Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep. https://doi.org/10.1093/sleep/zsag001 Basner, Mathias et al. "Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep" (2026), https://doi.org/10.1093/sleep/zsag001 Basner, Mathias et al. "Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep" , 2026, https://doi.org/10.1093/sleep/zsag001 Export RIS Citation Information. TY - Journal Article AU - Basner, Mathias AU - Smith, Michael G. AU - Cordoza, Makayla AU - Kayser, Matthew S. AU - Carlin, Michele AU - Ecker, Adrian J. AU - Gilad, Yoni AU - Park-Chavar, Sierra AU - Rennie, Ka’alana AU - Schneller, Victoria AU - Walsh, Sinead AU - Shou, Haochang AU - Cao, Quy AU - Younes, Magdy AU - Aeschbach, Daniel AU - Jones, Christopher W. A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - University of Pennsylvania A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Nighttime environmental noise (EN) exposure disturbs sleep and increases morbidity and mortality. Affordable and effective countermeasures are needed, but rigorous research is scarce. This study investigates the efficacy of pink noise (PN) and earplugs for mitigating the effects of intermittent EN on sleep. AB - This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license https://creativecommons.org/licenses/by/4.0/. Please cite this article as: Mathias Basner, Michael G Smith, Makayla Cordoza, Matthew S Kayser, Michele Carlin, Adrian J Ecker, Yoni Gilad, Sierra Park-Chavar, Ka’alana Rennie, Victoria Schneller, Sinead Walsh, Haochang Shou, Quy Cao, Magdy Younes, Daniel Aeschbach, Christopher W Jones, Efficacy of pink noise and earplugs for mitigating the effects of intermittent environmental noise exposure on sleep, Sleep, 2026;, zsag001, https://doi.org/10.1093/sleep/zsag001 AN - dot:89738 DO - https://doi.org/10.1093/sleep/zsag001 KW - Aircraft noise KW - Broadband KW - Noise KW - Environmental impacts KW - Sleep KW - Sleep deprivation KW - ASCENT LA - English PB - Oxford University Press PY - 2026-02-01 SN - sag001 TI - Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep M3 - Journal Article N1 - United States N1 - 13-C-AJFE-UPENN-015 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89738 ER -
Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report

Basner, Mathias

;

McGuire, Sarah

2016-08-01 | PDF

New field studies need to be conducted in the US to acquire current data relative to varying degrees of noise exposure to provide information on the effect of noise on sleep. As studies may need to investigate samples around multiple airports it will not be possible to use polysomnography to monitor sleep, as it has a high methodological cost. Inst ...

03/30/2026

Title : Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report Creator(s) : Basner, Mathias;McGuire, Sarah;Witte, Maryam; Corporate Creator(s) : University of Pennsylvania. School of Medicine Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy; Published Date : 2016-08-01 URL : https://rosap.ntl.bts.gov/view/dot/89737 Basner, Mathias et al. (2016). Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report. Basner, Mathias and McGuire, Sarah and Witte, Maryam "Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report" (2016) Basner, Mathias et al. "Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report" , 2016 Export RIS Citation Information. TY - Tech Report AU - Basner, Mathias AU - McGuire, Sarah AU - Witte, Maryam A2 - University of Pennsylvania. School of Medicine A3 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - New field studies need to be conducted in the US to acquire current data relative to varying degrees of noise exposure to provide information on the effect of noise on sleep. As studies may need to investigate samples around multiple airports it will not be possible to use polysomnography to monitor sleep, as it has a high methodological cost. Instead, the use of actigraphy and electrocardiography (ECG) has been examined. This approach is cost-effective, as individuals can be taught how to use the equipment on their own, and will allow a methodologically sound investigation of large subject cohorts to be investigated. This methodology was implemented in a pilot study conducted around Philadelphia International Airport. Eighty participants were recruited for the study, 40 from a region with aircraft noise exposure near the airport and 40 from a control region in Philadelphia County. Participants completed 3 nights of unattended physiological and noise measurements. The primary purpose of this study was to evaluate the feasibility of the ECG and actigraphy methodology. It was found that study participants could complete the measurements on their own with minimal data loss. AN - dot:89737 KW - Aircraft noise KW - Sleep deprivation KW - Field studies KW - Logistic regression analysis KW - Airport noise KW - ASCENT LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2016-08-01 TI - Pilot Sleep Study near Philadelphia International Airport — ASCENT Project 17 Report M3 - Tech Report N1 - United States N1 - 13-C-AJFE-UPenn-002 UR - https://rosap.ntl.bts.gov/view/dot/89737 ER -
Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT

Robert, William ;

Bliss, Abigail

2026-01-29 | PDF

Multi-objective decision analysis (MODA) provides transportation agencies with a structured process for identifying a set of investments that delivers the greatest impact toward their objectives. In the presented research, the research team developed a prototype MODA-based approach for prioritizing pavement rehabilitation and reconstruction project ...

03/30/2026

Title : Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT Creator(s) : Robert, William;Bliss, Abigail;Morrison, Constance; Corporate Creator(s) : Spy Pond Partners, LLC Corporate Contributor(s) : Michigan Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-01-29 Report Number : SPR-1764 URL : https://rosap.ntl.bts.gov/view/dot/89736 Robert, William et al. (2026). Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT. Robert, William and Bliss, Abigail and Morrison, Constance "Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT" (2026) Robert, William et al. "Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT" , 2026 Export RIS Citation Information. TY - Tech Report AU - Robert, William AU - Bliss, Abigail AU - Morrison, Constance A2 - Spy Pond Partners, LLC A3 - Michigan Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Multi-objective decision analysis (MODA) provides transportation agencies with a structured process for identifying a set of investments that delivers the greatest impact toward their objectives. In the presented research, the research team developed a prototype MODA-based approach for prioritizing pavement rehabilitation and reconstruction projects at the Michigan Department of Transportation (MDOT). Research activities included a review of best practices and MODA applications, development of goals and measures for quantifying projects’ anticipated impacts, and implementation and evaluation of the proposed MODA approach using 39 test projects. The research demonstrated that a MODA-based approach can be used to assess and prioritize the target set of projects based on their anticipated asset condition, safety, accessibility and mobility, and environmental impacts. Further research could include implementation and evaluation of the proposed approach with additional data or decision-support tools, as well as adaptation of the MODA approach to other program areas at MDOT. AN - dot:89736 ET - Final Report, 1/30/2024 - 1/30/2026 KW - Resource allocation KW - Project management KW - Decision making KW - Asset management KW - Transportation system management KW - Analysis KW - Optimization KW - Data analysis KW - project prioritization KW - multi-objective decision analysis KW - transportation asset management LA - English PB - Michigan Department of Transportation. Research Administration PY - 2026-01-29 SN - SPR-1764 TI - Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT M3 - Tech Report N1 - United States N1 - 2024-0192 UR - https://rosap.ntl.bts.gov/view/dot/89736 ER -
Beyond Bid-Build: Innovative Project Delivery Methods

United States. Department of Transportation. Federal Highway Administration

2026-02-20 | PDF

Many transportation agencies face tight budgets, price swings, staff shortages, and the loss of experienced workers, making it harder to deliver infrastructure projects efficiently. Traditionally, government contracts are awarded to the qualified lowest-priced bidder, but when bidders try too hard to offer the lowest price, they may underestimate t ...

03/30/2026

Title : Beyond Bid-Build: Innovative Project Delivery Methods Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Federal Highway Administration. Center for Accelerating Innovation Contributor(s) : Weisner, Kat;DeSanto, James;Urban, Melinda; Published Date : 2026-02-20 Report Number : FHWA-26-CAI-001 URL : https://rosap.ntl.bts.gov/view/dot/89735 United States. Department of Transportation. Federal Highway Administration (2026). Beyond Bid-Build: Innovative Project Delivery Methods. United States. Department of Transportation. Federal Highway Administration "Beyond Bid-Build: Innovative Project Delivery Methods" (2026) United States. Department of Transportation. Federal Highway Administration "Beyond Bid-Build: Innovative Project Delivery Methods" , 2026 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Federal Highway Administration. Center for Accelerating Innovation A4 - Weisner, Kat A4 - DeSanto, James A4 - Urban, Melinda AB - Many transportation agencies face tight budgets, price swings, staff shortages, and the loss of experienced workers, making it harder to deliver infrastructure projects efficiently. Traditionally, government contracts are awarded to the qualified lowest-priced bidder, but when bidders try too hard to offer the lowest price, they may underestimate the work. This can lead to lower-quality results, contract changes, delays, and higher costs, especially on complex projects. Alternative Contracting Methods (ACMs) offer a more strategic approach, allowing agencies to tailor procurement to a project’s unique circumstances, helping agencies meet their goals faster, smarter, and with better long-term results. AN - dot:89735 KW - Project delivery KW - Innovation KW - Design bid build KW - Contracting LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2026-02-20 SN - FHWA-26-CAI-001 TI - Beyond Bid-Build: Innovative Project Delivery Methods M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89735 ER -
Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce

United States. Department of Transportation. Federal Highway Administration

2021-08-11 | PDF

Maintaining a strong, capable highway construction workforce keeps the nation’s transportation industry and economy moving forward. In an effort to identify, train, and place qualified individuals into needed roles, the U.S. Department of Transportation’s Federal Highway Administration (FHWA) established the Highway Construction Workforce Partnersh ...

03/30/2026

Title : Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Contributor(s) : Caliendo, Michael;Chavez, Robert;Koss, Jason; Published Date : 2021-08-11 URL : https://rosap.ntl.bts.gov/view/dot/89734 United States. Department of Transportation. Federal Highway Administration (2021). Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce. United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce" (2021) United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce" , 2021 Export RIS Citation Information. TY - Tech Report A2 - United States. Department of Transportation. Federal Highway Administration A4 - Caliendo, Michael A4 - Chavez, Robert A4 - Koss, Jason AB - Maintaining a strong, capable highway construction workforce keeps the nation’s transportation industry and economy moving forward. In an effort to identify, train, and place qualified individuals into needed roles, the U.S. Department of Transportation’s Federal Highway Administration (FHWA) established the Highway Construction Workforce Partnership (HCWP). By bringing together highway construction, education, and workforce interests at state and local levels, partner working groups form to identify needs and resources to fill industry workforce gaps. HCWPs in Idaho, Los Angeles, and Pittsburgh have refined recruitment to maintain a consistent flow of applicants for highway construction positions. AN - dot:89734 KW - Education and training KW - Training KW - Road construction KW - Road construction industry KW - Transportation careers LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2021-08-11 TI - Highway Construction Workforce Partnership: Strategic Workforce Development: Recruiting Tomorrow's Highway Construction Workforce M3 - Tech Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89734 ER -
Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships

United States. Department of Transportation. Federal Highway Administration

2022-04-04 | PDF

Keeping a constant flow of skilled individuals ready to enter the highway construction workforce is critical to maintaining safe roadways in Texas. To help meet that need and offer lasting career potential to individuals who typically may not be provided such options, the Texas Department of Transportation (TxDOT) established its ConnectU2Jobs prog ...

03/30/2026

Title : Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2022-04-04 URL : https://rosap.ntl.bts.gov/view/dot/89733 United States. Department of Transportation. Federal Highway Administration (2022). Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships. United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships" (2022) United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships" , 2022 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration AB - Keeping a constant flow of skilled individuals ready to enter the highway construction workforce is critical to maintaining safe roadways in Texas. To help meet that need and offer lasting career potential to individuals who typically may not be provided such options, the Texas Department of Transportation (TxDOT) established its ConnectU2Jobs program. The Highway Construction Workforce Partnership (HCWP) includes TxDOT, Federal Highway Administration (FHWA), Texas Workforce Commission, Dallas College, Workforce Solutions Greater Dallas, Regional Black Contractors Association, Regional Hispanic Contractors Association, Lone Star Justice Alliance, and Associated General Contractors of Texas. AN - dot:89733 KW - Education and training KW - Training KW - Road construction KW - Road construction industry KW - Transportation careers KW - Partnerships LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2022-04-04 TI - Highway Construction Workforce Partnership: Strategic Workforce Development: Texas's ConnectU2Jobs Program Changes Lives through Community Partnerships M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89733 ER -
Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources

Cahill, Patricia

2000-04-01 | PDF

In the fall of 1998, the Federal Aviation Administration (FAA) initiated a program of intense testing, i.e., full-scale testing, intermediate testing, bench-scale testing, and electrical ignition testing on thermal acoustical insulation. This work was prompted by several factors related to current fire test requirements, including the crash of the ...

03/30/2026

Title : Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources Creator(s) : Cahill, Patricia Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Airport and Aircraft Safety Research and Development Division. Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research Published Date : 2000-04-01 Report Number : DOT/FAA/AR-TN00/20 URL : https://rosap.ntl.bts.gov/view/dot/89732 Cahill, Patricia (2000). Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources. Cahill, Patricia "Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources" (2000) Cahill, Patricia "Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources" , 2000 Export RIS Citation Information. TY - Tech Report AU - Cahill, Patricia A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Airport and Aircraft Safety Research and Development Division. A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research AB - In the fall of 1998, the Federal Aviation Administration (FAA) initiated a program of intense testing, i.e., full-scale testing, intermediate testing, bench-scale testing, and electrical ignition testing on thermal acoustical insulation. This work was prompted by several factors related to current fire test requirements, including the crash of the Swissair MD-11 off the coast of Canada, and the failure of an industry fire test standard called the cotton swab test to characterize the flammability characteristics of a certain foam and fiberglass cover material. Electrical testing was an important part of this program due to the number of reported incidents involving flame spread on thermal acoustical insulation blankets caused by electrical failures such as short circuits. The thermal acoustical insulation films tested in this program were polyimide, metallized and nonmetallized polyester poly (ethylene terepthalate) (PET) and metallized poly (vinyl fluoride) (PVF). Each of these materials was used to fabricate test blankets with 0.42 pound per cubic foot (pcf) fiberglass batting. The test blankets were subjected to 115-and 208-volt electrical arcing tests. This same testing was performed on these blankets with a corrosion inhibiting compound (CIC) sprayed on them. The data showed that the metallized PET blankets ignited with significant flame spread at both voltages with and without CIC. The polyimide and metallized PVF blankets did not ignite at either voltage when tested plain or with CIC application. The plain PET blankets ignited at both voltages, with minimal flame spread, and the fire self-extinguished within seconds. When tested with CIC at 115 volts, flaming in the seam area occurred but self-extinguished within seconds. No ignition occurred at 208 volts. AN - dot:89732 ET - Technical Note KW - Acoustic materials KW - Sound insulating materials KW - Aircraft KW - Insulation blankets KW - Corrosion resistant materials KW - Electric arcs KW - Flammability tests KW - Ignition KW - Polyester resins KW - Protective coating KW - Heat insulating materials KW - Arc discharges KW - Blankets KW - Corrosion inhibitors KW - PET(Poly(ethylene KW - PVF(Poly(vinyl fluoride)) LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 2000-04-01 SN - DOT/FAA/AR-TN00/20 TI - Flammability of Aircraft Insulation Blankets Subjected to Electrical Arc Ignition Sources M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89732 ER -
Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design

Hossain, M. Shabbir ;

Nair, Harikrishnan

2026-03-01 | PDF

In 2018, the Virginia Department of Transportation (VDOT) implemented the American Association of State Highway and Transportation Officials’ (AASHTO) AASHTOWare-ME version 2.2.6 as the pavement design methodology for new, reconstruction, and lane-widening projects, including interstate, primary, and secondary routes with annual average daily traff ...

03/30/2026

Title : Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design Creator(s) : Hossain, M. Shabbir;Nair, Harikrishnan; Corporate Creator(s) : Virginia Transportation Research Council (VTRC) Corporate Contributor(s) : Virginia. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-03-01 Report Number : FHWA/VTRC 26-R35 URL : https://rosap.ntl.bts.gov/view/dot/89731 Hossain, M. Shabbir and Nair, Harikrishnan (2026). Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design. Hossain, M. Shabbir and Nair, Harikrishnan "Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design" (2026) Hossain, M. Shabbir and Nair, Harikrishnan "Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design" , 2026 Export RIS Citation Information. TY - Tech Report AU - Hossain, M. Shabbir AU - Nair, Harikrishnan A2 - Virginia Transportation Research Council (VTRC) A3 - Virginia. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - In 2018, the Virginia Department of Transportation (VDOT) implemented the American Association of State Highway and Transportation Officials’ (AASHTO) AASHTOWare-ME version 2.2.6 as the pavement design methodology for new, reconstruction, and lane-widening projects, including interstate, primary, and secondary routes with annual average daily traffic greater than 10,000 vehicles. The Mechanistic-Empirical Pavement Design Guide (MEPDG) and the AASHTOWare Pavement ME software provided an improved process for conducting pavement analysis and for developing pavement designs based on mechanistic-empirical principles. To facilitate the pavement design, MEPDG recommends the resilient modulus (Mr) to characterize the subgrade soils. As part of VDOT’s MEPDG implementation efforts, the Materials Division Soils Lab collected both fine-and coarse-grained soil samples from around the state on which to perform Mr tests. For fine-grained soils (A-4, A-5, A-6, and A-7), a correlation with unconfined compression strength was developed in a Virginia Transportation Research Council study that is currently being used to estimate design Mr for high-volume projects (annual average daily traffic > 10,000) as an alternative to actual Mr testing. Also, enough fine-grained soils were tested to determine statewide average Mr values to be used in the design of low-volume roadways (annual average daily traffic < 10,000). However, no statewide average Mr values or correlations are currently available for coarse-grained soils (A-1, A-2, and A-3). Although some actual measured Mr values of coarse-grained soil are available, they are significantly less than AASHTO-recommended Mr values (MEPDG default), which needs to be further investigated. During this study, six coarse-grained soil samples were tested for Mr at standard Proctor compactive effort: three A-2-4, one A-26, and two A-3. The Mr values at a confining pressure of 2 psi and a deviator stress of 6 psi were less than MEPDG-recommended default values, but they are comparable with measured values reported in the literature. Sample compaction density and moisture influenced the Mr values. The Mr value of any coarse-grained soil showed a decreasing trend with increasing degrees of saturation, a combining measure of compaction density and moisture. A few soil index properties showed good correlation with Mr values. A predictive model could not be recommended because of limited data points, that is, only six soil samples. AN - dot:89731 ET - Final report: November 2022 -October 2025 KW - Pavement subgrade KW - Modulus of resilience KW - Coarse grained soils KW - Pavement design KW - Mechanistic-empirical pavement design KW - Testing KW - Mathematical prediction LA - English PB - Virginia Transportation Research Council (VTRC) PY - 2026-03-01 SN - FHWA/VTRC 26-R35 TI - Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design M3 - Tech Report N1 - United States N1 - 122364 UR - https://rosap.ntl.bts.gov/view/dot/89731 ER -
Project 42 Acoustical Model of Mach Cut-off Flight

Sparrow, Victor W. ;

Bailey, Michael

2017-08-01 | PDF

Georgia Tech has completed the research plan for this task. Georgia Tech has also acquired both the source code and executable for PCBoom 6.7. PCBoom 6.7 was used to perform the sensitivity analysis on the acoustical model provided by Aerion, Volpe, and Penn State University. Georgia Tech completed the initial benchmarking study for the sensitivity ...

03/30/2026

Title : Project 42 Acoustical Model of Mach Cut-off Flight Creator(s) : Sparrow, Victor W.;Bailey, Michael;Mavris, Dimitri N.;Page, Juliet A.;Vigeant, Michelle C.;Tai, Jimmy;Busch, Greg;Huang, Zhendong;Ortega, Nick;Duca, Ruxandra;Mohan, Ratheesvar; Corporate Creator(s) : Georgia Tech Research Corporation;Pennsylvania State University;University of Washington;John A. Volpe National Transportation Systems Center (U.S.); Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy; Published Date : 2017-08-01 URL : https://rosap.ntl.bts.gov/view/dot/89730 Sparrow, Victor W. et al. (2017). Project 42 Acoustical Model of Mach Cut-off Flight. Sparrow, Victor W. et al. "Project 42 Acoustical Model of Mach Cut-off Flight" (2017) Sparrow, Victor W. et al. "Project 42 Acoustical Model of Mach Cut-off Flight" , 2017 Export RIS Citation Information. TY - Tech Report AU - Sparrow, Victor W. AU - Bailey, Michael AU - Mavris, Dimitri N. AU - Page, Juliet A. AU - Vigeant, Michelle C. AU - Tai, Jimmy AU - Busch, Greg AU - Huang, Zhendong AU - Ortega, Nick AU - Duca, Ruxandra AU - Mohan, Ratheesvar A2 - Georgia Tech Research Corporation A2 - Pennsylvania State University A2 - University of Washington A2 - John A. Volpe National Transportation Systems Center (U.S.) A3 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Georgia Tech has completed the research plan for this task. Georgia Tech has also acquired both the source code and executable for PCBoom 6.7. PCBoom 6.7 was used to perform the sensitivity analysis on the acoustical model provided by Aerion, Volpe, and Penn State University. Georgia Tech completed the initial benchmarking study for the sensitivity of Mach cut-off flight on a standard sonic boom signature (F-18 geometry provided with the executable). Georgia Tech assessed the sensitivity of the resultant ground boom strength and shape of the F-18 model with variations in atmospheric temperature and humidity as well as various flight Mach numbers. A tool to help facilitate the execution of task 4, the PCBoom wrapper, was developed and utilized. The Aerion AS2 model was successfully incorporated into the study, and the sensitivity of the model was assessed for both Mach cut-on and Mach cut-off conditions. The sensitivity study was performed and completed for various temperatures, winds, and relative humidity in both standard atmospheric profiles and realistic atmospheric profiles. The results of the study were compiled and presented in this report. Task 5 was completed through extensive research into various technologies that could help enable Mach cut-off flight. Insight on many of the technologies was solicited from scientists and researcher in the atmospheric sciences. The most promising technologies were investigated further, and a summary of those technologies is presented in this report. AN - dot:89730 KW - Acoustics KW - Aircraft noise KW - Supersonic aircraft KW - Mach number KW - Aviation KW - ASCENT LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2017-08-01 TI - Project 42 Acoustical Model of Mach Cut-off Flight M3 - Tech Report N1 - United States N1 - 13-C-AJFE-GIT-023 UR - https://rosap.ntl.bts.gov/view/dot/89730 ER -
Project 010 Aircraft Technology Modeling and Assessment

Mavris, Dimitri N.

;

Crossley, William

2023-12-01 | PDF

For duration of Project 10’s period of performance, the research activities have remained consistent on technology modeling, system level assessment and fleet level modeling. These activities were conducted for subsonic fleet from 2014 to 2017 and focused on supersonic fleet from 2017 to 2023. The final report focuses on the latter in which Georgia ...

03/30/2026

Title : Project 010 Aircraft Technology Modeling and Assessment Creator(s) : Mavris, Dimitri N.;Crossley, William;Tai, Jimmy C.;DeLaurentis, Daniel;Ahuja, Jai;Perron, Christian;Lee, Chung;Stewart, Brennan;Kenny, James D.;Pfaender, Holger;Baltman, Edan;Azevedo, Joao de;Sampaio, Barbara;Vlady, Ted;Iyengar, Nikhil;Roohi, Zayne;Varadharajan, Srikanth Tindivanam;Tegen, Carter J.;Kalaria, Divya K.;Macy, Madeleine E. Graham;Mane, Muharrem;Fung, Tien-Yueh;Doma, Krinal; Corporate Creator(s) : Georgia Institute of Technology Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment Published Date : 2023-12-01 URL : https://rosap.ntl.bts.gov/view/dot/89729 Mavris, Dimitri N. et al. (2023). Project 010 Aircraft Technology Modeling and Assessment. Mavris, Dimitri N. et al. "Project 010 Aircraft Technology Modeling and Assessment" (2023) Mavris, Dimitri N. et al. "Project 010 Aircraft Technology Modeling and Assessment" , 2023 Export RIS Citation Information. TY - Tech Report AU - Mavris, Dimitri N. AU - Crossley, William AU - Tai, Jimmy C. AU - DeLaurentis, Daniel AU - Ahuja, Jai AU - Perron, Christian AU - Lee, Chung AU - Stewart, Brennan AU - Kenny, James D. AU - Pfaender, Holger AU - Baltman, Edan AU - Azevedo, Joao de AU - Sampaio, Barbara AU - Vlady, Ted AU - Iyengar, Nikhil AU - Roohi, Zayne AU - Varadharajan, Srikanth Tindivanam AU - Tegen, Carter J. AU - Kalaria, Divya K. AU - Macy, Madeleine E. Graham AU - Mane, Muharrem AU - Fung, Tien-Yueh AU - Doma, Krinal A2 - Georgia Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment AB - For duration of Project 10’s period of performance, the research activities have remained consistent on technology modeling, system level assessment and fleet level modeling. These activities were conducted for subsonic fleet from 2014 to 2017 and focused on supersonic fleet from 2017 to 2023. The final report focuses on the latter in which Georgia Tech and Purdue University teams have partnered to investigate the future demand for supersonic air travel and the environmental impacts of supersonic transports (SSTs). The combined team investigated the environmental impacts include direct carbon dioxide (CO2) emissions, noise, and fuel consumption. The primary objective of this research project is to support the FAA in modeling and assessing the potential future evolution of the next-generation supersonic aircraft fleet. The research in this project consists of five integrated focus areas: (a) establishing fleet assumptions and performing demand assessment (completed in 2021); (b) performing preliminary SST environmental impact prediction (completed in 2023); (c) developing approaches to model SSTs within the FAA Aviation Environmental Design Tool (completed in 2022); (d) performing vehicle and fleet assessments of potential future supersonic aircraft (completed in this report); and (e) performing physics-based modeling of SSTs and conceptual design by using the Framework for Advanced Supersonic Transport (FASST) (completed in the report). AN - dot:89729 ET - Final Report KW - Sonic boom KW - Aerodynamic noise KW - Aircraft noise KW - Civil aviation KW - Environmental impacts KW - Standards KW - Supersonic aircraft LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2023-12-01 TI - Project 010 Aircraft Technology Modeling and Assessment M3 - Tech Report N1 - United States N1 - 13-C-AJFE-GIT-006 UR - https://rosap.ntl.bts.gov/view/dot/89729 ER -

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