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Showing 61 - 80 of 548 results

Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions

Benavidez-Brouk, Lauren

;

Taheripour, Farzad

2026-02-01 | PDF

Emissions from land use changes are relevant for environmental policy analysis. Since the late 1990s and early 2000s many of these analyses have examined induced land use changes (ILUC) from biofuel production and policy as well as their associated greenhouse gas (GHG) emissions. These studies have often used the Harmonized World Soil Data (HWSD) t ...

03/30/2026

Title : Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions Creator(s) : Benavidez-Brouk, Lauren;Taheripour, Farzad;Baldos, Uris;Zhuang, Qianlai;Chen, Shuo; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Purdue University; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2026-02-01 Report Number : ERC8 025013 DOI : https://doi.org/10.1088/2515-7620/ae3d84 Benavidez-Brouk, Lauren et al. (2026). Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions. https://doi.org/10.1088/2515-7620/ae3d84 Benavidez-Brouk, Lauren et al. "Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions" (2026), https://doi.org/10.1088/2515-7620/ae3d84 Benavidez-Brouk, Lauren et al. "Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions" , 2026, https://doi.org/10.1088/2515-7620/ae3d84 Export RIS Citation Information. TY - Journal Article AU - Benavidez-Brouk, Lauren AU - Taheripour, Farzad AU - Baldos, Uris AU - Zhuang, Qianlai AU - Chen, Shuo A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Purdue University A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Emissions from land use changes are relevant for environmental policy analysis. Since the late 1990s and early 2000s many of these analyses have examined induced land use changes (ILUC) from biofuel production and policy as well as their associated greenhouse gas (GHG) emissions. These studies have often used the Harmonized World Soil Data (HWSD) to evaluate the corresponding changes in soil organic carbon (SOC) as a part of their assessments. However, those modeling efforts that used this data set have not necessarily implemented its latest version, and therefore, their results may not represent the most recent available SOC data sources. As an example, the AEZ-EF model, which has been frequently used in assessing ILUC emissions, is using the oldest version of this data set. To improve the quality and accuracy of ILUC estimates, this paper creates a new global data set of SOC by combining the latest version of the HWSD (V.2.0) with newly available national soil maps for the USA and Australia. Using this new data set, we then calculate the average SOC for each land cover type (cropland, pasture, and forest) by country and by agro-ecological zones (AEZs). Furthermore, we revised AEZ-EF model to adopt the new SOC data by land types. Finally, the revised AEZ-EF model is used to assess ILUC emissions for a few biofuel pathways to demonstrate the extent to which the new SOC data may affect ILUC emissions. The results of this paper indicate that the newest version of the HWSD represents a lower level of SOC at the global scale compared to its older version. The results also show that the revised AEZ-EF model calculates relatively lower ILUC emissions for the examined pathways compared to its older version. 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: Lauren Benavidez-Brouk et al 2026 Environ. Res. Commun. 8 025013. https://doi.org/10.1088/2515-7620/ae3d84 AN - dot:89728 DO - https://doi.org/10.1088/2515-7620/ae3d84 KW - Land use KW - Pollutants KW - Environmental impacts KW - Soil remediation KW - Biomass fuels KW - ASCENT LA - English PB - IOP Publishing PY - 2026-02-01 SN - ERC8 025013 TI - Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions M3 - Journal Article N1 - United States N1 - 13-C-AJFE-PU-058 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89728 ER -
Integrated Digital Project Delivery

United States. Department of Transportation. Federal Highway Administration

2026-02-23 | PDF

Despite the widespread use of basic digital tools, many transportation projects still face delays and data gaps throughout the planning, development, and maintenance process. The current paper and PDF-based workflows require staff to manually re-enter the same information into multiple systems. This increases the risk of errors and slows down proje ...

03/30/2026

Title : Integrated Digital Project Delivery 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) : Gray, James;Corrigan, Matthew; Published Date : 2026-02-23 Report Number : FHWA-26-CAI-004 URL : https://rosap.ntl.bts.gov/view/dot/89727 United States. Department of Transportation. Federal Highway Administration (2026). Integrated Digital Project Delivery. United States. Department of Transportation. Federal Highway Administration "Integrated Digital Project Delivery" (2026) United States. Department of Transportation. Federal Highway Administration "Integrated Digital Project Delivery" , 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 - Gray, James A4 - Corrigan, Matthew AB - Despite the widespread use of basic digital tools, many transportation projects still face delays and data gaps throughout the planning, development, and maintenance process. The current paper and PDF-based workflows require staff to manually re-enter the same information into multiple systems. This increases the risk of errors and slows down project updates. Important data for bridges, pavements, and utilities is often stored in separate databases, making it hard to find one shared, reliable source of information. In addition, many State agencies’ software systems used for design, construction, and asset management, do not work well together, limiting the ability to share 3D models. Outdated survey and design manuals fail to reflect current tools and technologies like LiDAR, 3D modeling, and Unmanned Aerial Systems (UAS). The Integrated Digital Project Delivery initiative addresses these challenges by creating a connected, consistent approach to managing project data from early planning to long-term maintenance. AN - dot:89727 KW - Integrated project delivery KW - Project management KW - Data management KW - Data sharing LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2026-02-23 SN - FHWA-26-CAI-004 TI - Integrated Digital Project Delivery M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89727 ER -
Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor

Vishwanath, Rahul ;

Olimid, Dominic

2025-03-01 | PDF

Conventional aviation combustors use liquid fuels where spray atomization is important for efficient combustion process and resultant emissions. In this study, a three-sector combustor with commercial pre-filming air blast injectors is utilized to analyze the effect of operating conditions on spray and soot formation. Measurements are performed wit ...

03/30/2026

Title : Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor Creator(s) : Vishwanath, Rahul;Olimid, Dominic;Douglas, Eric;Bibik, Oleksandr;Wehe, Shawn;Mazumdar, Yi Chen;Steinberg, Adam;Sun, Wenting; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Georgia Institute of Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2025-03-01 Report Number : 1C09-110490475 URL : https://rosap.ntl.bts.gov/view/dot/89726 Vishwanath, Rahul et al. (2025). Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor. Vishwanath, Rahul et al. "Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor" (2025) Vishwanath, Rahul et al. "Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor" , 2025 Export RIS Citation Information. TY - Proceedings AU - Vishwanath, Rahul AU - Olimid, Dominic AU - Douglas, Eric AU - Bibik, Oleksandr AU - Wehe, Shawn AU - Mazumdar, Yi Chen AU - Steinberg, Adam AU - Sun, Wenting A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Georgia Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Conventional aviation combustors use liquid fuels where spray atomization is important for efficient combustion process and resultant emissions. In this study, a three-sector combustor with commercial pre-filming air blast injectors is utilized to analyze the effect of operating conditions on spray and soot formation. Measurements are performed with both Jet-A and sustainable aviation fuel (SAF) at different operating pressures, preheat temperatures and global equivalence ratios. Phase Doppler particle anemometry is utilized to measure instantaneous drop-sizes in both non-reacting and reacting conditions. Instantaneous soot particle temperature and soot volume fraction distributions were measured in the primary zone of the combustor using two-color planar auto-compensating laser induced incandescence for both Jet-A and SAF flames. The drop-sizes shifted towards larger diameters for reacting conditions compared to non-reacting flow, possibly indicating the complete evaporation of smaller droplets at a given operating condition. In comparison to Jet-A, SAF fuel spray produced slightly smaller droplets owing to its reduced surface tension and higher vapor pressure values. The maximum averaged SVF were observed to be along the main reaction zone with values around 5 ppm for Jet-A flames at the operated conditions. For the SAF flames at the same conditions, the averaged SVF reduced by almost 2-3 times compared to Jet-A flames. AN - dot:89726 KW - Aviation KW - Flammability KW - Chemical sprays KW - Chemical dispersions KW - Doppler effect KW - Lasers KW - ASCENT KW - swirl-stabilized Jet-A/SAF flames KW - soot in high pressure Jet-A flames KW - spray atomization KW - phase Doppler anemometry KW - laser induced incandescence LA - English PB - Eastern States Section of the Combustion Institute PY - 2025-03-01 SN - 1C09-110490475 TI - Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor M3 - Proceedings N1 - United States N1 - 13-C-AJFE-GIT-080 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89726 ER -
Contrail Observation Limitations Using Geostationary Satellites

Euchenhofer, Marlene V. ;

Prashanth, Prakash

2025-11-01 | PDF

Contrails are a significant contributor to aviation's climate impact with an effective radiative forcing similar to that from aviation's CO2 emissions, yet large uncertainties remain. Many observational contrail studies rely on data from a single sensor, in recent years increasingly from a geostationary imager, accepting lower spatial resolution in ...

03/30/2026

Title : Contrail Observation Limitations Using Geostationary Satellites Creator(s) : Euchenhofer, Marlene V.;Prashanth, Prakash;Parke, Sydney A.;Eastham, Sebastian D.;Waitz, Ian A.; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Massachusetts Institute of Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2025-11-01 Report Number : 2025GL118386 DOI : https://doi.org/10.1029/2025GL118386 Euchenhofer, Marlene V. et al. (2025). Contrail Observation Limitations Using Geostationary Satellites. https://doi.org/10.1029/2025GL118386 Euchenhofer, Marlene V. et al. "Contrail Observation Limitations Using Geostationary Satellites" (2025), https://doi.org/10.1029/2025GL118386 Euchenhofer, Marlene V. et al. "Contrail Observation Limitations Using Geostationary Satellites" , 2025, https://doi.org/10.1029/2025GL118386 Export RIS Citation Information. TY - Journal Article AU - Euchenhofer, Marlene V. AU - Prashanth, Prakash AU - Parke, Sydney A. AU - Eastham, Sebastian D. AU - Waitz, Ian A. A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Massachusetts Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Contrails are a significant contributor to aviation's climate impact with an effective radiative forcing similar to that from aviation's CO2 emissions, yet large uncertainties remain. Many observational contrail studies rely on data from a single sensor, in recent years increasingly from a geostationary imager, accepting lower spatial resolution in exchange for higher temporal and spatial coverage. However, the ability of geostationary imagery to resolve contrails has not been systematically characterized. By comparing higher spatial resolution low Earth orbit satellite imagery from Visual Infrared Imaging Radiometer Suite (VIIRS) to geostationary satellite imagery from GOES ABI, we show that the latter does not resolve 80% of the contrails nor half of the total length compared to contrails identified with VIIRS. Our findings underscore the need for multi‐sensor approaches to collect observational contrail data for improved validation of climate models and to enable more rigorous and verifiable contrail avoidance strategies. 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: Euchenhofer, M. V., Prashanth, P., Parke, S. A., Eastham, S. D., & Waitz, I. A. (2025). Contrail observation limitations using geostationary satellites. Geophysical Research Letters, 52, e2025GL118386. https://doi.org/10.1029/2025GL118386 AN - dot:89725 DO - https://doi.org/10.1029/2025GL118386 KW - Aircraft KW - Aircraft exhaust gases KW - Navigational satellites KW - Climate KW - ASCENT KW - geostationary satellites LA - English PB - Wiley Periodicals LLC PY - 2025-11-01 SN - 2025GL118386 TI - Contrail Observation Limitations Using Geostationary Satellites M3 - Journal Article N1 - United States N1 - 13-C-AJFE-MIT-086 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89725 ER -
Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach

Kim, Yongju

;

Chen, Sikai

2026-03-01 | PDF

Connected and automated vehicles (CAVs) rely on digitally acquired traffic state information for real-time maneuver decisions, making them vulnerable to cyberattacks that manipulate perceived traffic states or communication channels. Such manipulation can subtly alter vehicle behavior and, in interactive traffic environments, may propagate disturba ...

03/30/2026

Title : Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach Creator(s) : Kim, Yongju;Chen, Sikai;Ahn, Soyoung (Sue);Chitturi, Madhav;Noyce, David A.; Corporate Creator(s) : Center for Connected and Automated Transportation (CCAT);University of Wisconsin--Madison; 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 : 2026-03-01 Report Number : GR000034957 URL : https://rosap.ntl.bts.gov/view/dot/89724 Kim, Yongju et al. (2026). Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach. Kim, Yongju et al. "Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach" (2026) Kim, Yongju et al. "Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach" , 2026 Export RIS Citation Information. TY - Tech Report AU - Kim, Yongju AU - Chen, Sikai AU - Ahn, Soyoung (Sue) AU - Chitturi, Madhav AU - Noyce, David A. A2 - Center for Connected and Automated Transportation (CCAT) A2 - University of Wisconsin--Madison 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 - Connected and automated vehicles (CAVs) rely on digitally acquired traffic state information for real-time maneuver decisions, making them vulnerable to cyberattacks that manipulate perceived traffic states or communication channels. Such manipulation can subtly alter vehicle behavior and, in interactive traffic environments, may propagate disturbances beyond the attacked vehicle. The objective of this study is to develop frameworks for (i) detecting abnormal lane-changing under cyberattacks and (ii) enabling robust decision-making under adversarial conditions. For detection, a physics-guided neural network integrating a game-theoretic lane-changing model with LSTM learning is developed and evaluated using the I-24 MOTION dataset under simulated false data injection and denial-of-service attacks. Results show improved prediction accuracy and effective detection of falsified lane-changing behaviors. For robust control, a hierarchical adversarial reinforcement learning framework is proposed for discretionary lane-changing under bounded perturbations. Simulation results indicate improved traffic efficiency while maintaining safety under worst-case perturbations. These findings provide a modeling foundation for cybersecurity-aware monitoring and robust tactical decision-making in CAV systems. AN - dot:89724 ET - Final report (April 2024 – March 2026) KW - Connected vehicles KW - Intelligent transportation systems KW - Computer security KW - Lane changing KW - Detectors KW - Neural networks KW - Decision making KW - Simulation KW - Evaluation KW - Data access control KW - Communication devices KW - Anomaly detection KW - Physics-guided neural network KW - Adversarial reinforcement learning LA - English PB - University of Michigan. Center for Connected and Automated Transportation PY - 2026-03-01 SN - GR000034957 TI - Security Defense of Transportation Networks Against Cyberattacks: A Physics-Informed AI Approach M3 - Tech Report N1 - United States N1 - 69A3552348305 UR - https://rosap.ntl.bts.gov/view/dot/89724 ER -
Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data

Pandey, Shailaja Ratna ;

Esteghamati, Mohsen Zaker

2025-02-01 | PDF

Condition assessment of how transportation infrastructure supports safe and reliable road and highway operation. Departments of Transportation across the country rely heavily on manual inspections, which are time-consuming and costly. This study evaluated whether modern computer vision (CV) methods can support traffic sign condition assessment alon ...

03/30/2026

Title : Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data Creator(s) : Pandey, Shailaja Ratna;Esteghamati, Mohsen Zaker; Corporate Creator(s) : Utah State University. Department of Civil and Environmental Engineering Corporate Contributor(s) : Utah. Department of Transportation. Research and Innovation Division;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-02-01 Report Number : UT- 26.03 URL : https://rosap.ntl.bts.gov/view/dot/89723 Pandey, Shailaja Ratna and Esteghamati, Mohsen Zaker (2025). Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data. Pandey, Shailaja Ratna and Esteghamati, Mohsen Zaker "Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data" (2025) Pandey, Shailaja Ratna and Esteghamati, Mohsen Zaker "Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data" , 2025 Export RIS Citation Information. TY - Tech Report AU - Pandey, Shailaja Ratna AU - Esteghamati, Mohsen Zaker A2 - Utah State University. Department of Civil and Environmental Engineering A3 - Utah. Department of Transportation. Research and Innovation Division A3 - United States. Department of Transportation. Federal Highway Administration AB - Condition assessment of how transportation infrastructure supports safe and reliable road and highway operation. Departments of Transportation across the country rely heavily on manual inspections, which are time-consuming and costly. This study evaluated whether modern computer vision (CV) methods can support traffic sign condition assessment along Utah highways. High-resolution roadway images collected using a camera-mounted vehicle were curated and annotated for three sign types (regulatory, warning, and guide) and four defect conditions (fading, delamination, missing letters/symbols, and broken signs) based on the Manual on Uniform Traffic Control Devices (MUTCD) standards. This study compared two different CV algorithms of YOLO11 and RT-DETR for traffic-sign detection and defect classification. Overall, the CV models showed promising performance for defect cases where an adequate number of training data existed. For example, for fading, YOLO11 and RT-DETR achieved 75% F1 on the validation. Binary classification of delamination (i.e., delamination versus no delamination) yielded similar performance for both models (68% F1). In contrast, the models showed poor performance to identify missing letters/symbols due to texture overlap with delamination and a limited number of annotated sign images with such defects. The results suggested that data quality and label definition had a greater impact on model performance than the choice of algorithms for the studied models. AN - dot:89723 ET - Final Report: July 2024 to Dec 2025 KW - Traffic signs KW - Assessments KW - Computer vision KW - Object detection KW - Optical devices KW - Transformers KW - Evaluation KW - Cameras KW - Data analysis KW - Algorithms KW - Delamination KW - Benchmarks KW - Performance KW - Assets KW - Traffic sign condition assessment KW - Computer vision KW - Object detection KW - YOLO11 KW - Vision transformers KW - MUTCD LA - English PB - Utah Department of Transportation PY - 2025-02-01 SN - UT- 26.03 TI - Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data M3 - Tech Report N1 - United States N1 - 25-8073 UR - https://rosap.ntl.bts.gov/view/dot/89723 ER -
What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief]

Sharma, Deepak K. ;

Lekhi, Rajnish

2026-03-01 | PDF

California High-Speed Rail (CHSR) has been under development for more than a decade, yet progress has been slowed by delays, cost escalation, and unstable funding. This research examined the main barriers to timely and cost-effective delivery of CHSR and identified lessons that can guide future high-speed rail (HSR) projects in California. The stud ...

03/30/2026

Title : What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief] Creator(s) : Sharma, Deepak K.;Lekhi, Rajnish;Parr, Scott A.; Corporate Creator(s) : San Jose State University. College of Business. Mineta Transportation Institute;California State University, Fullerton; Corporate Contributor(s) : State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration;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 : 2026-03-01 Report Number : 2470 URL : https://rosap.ntl.bts.gov/view/dot/89722 Sharma, Deepak K. et al. (2026). What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief]. Sharma, Deepak K. and Lekhi, Rajnish and Parr, Scott A. "What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief]" (2026) Sharma, Deepak K. et al. "What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief]" , 2026 Export RIS Citation Information. TY - Brief AU - Sharma, Deepak K. AU - Lekhi, Rajnish AU - Parr, Scott A. A2 - San Jose State University. College of Business. Mineta Transportation Institute A2 - California State University, Fullerton A3 - State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration 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 - California High-Speed Rail (CHSR) has been under development for more than a decade, yet progress has been slowed by delays, cost escalation, and unstable funding. This research examined the main barriers to timely and cost-effective delivery of CHSR and identified lessons that can guide future high-speed rail (HSR) projects in California. The study asked: Why has CHSR struggled to advance as planned, and what changes are needed to improve outcomes? To answer this, we compared CHSR with international HSR projects, studied Japan’s land readjustment approach, reviewed U.S. rail integration practices, analyzed California’s transportation legislation, and examined oversight reports and expert interviews. The results show that CHSR’s biggest barriers are structural, not technical. Stable funding, stronger governance, and legal reforms are needed to keep projects on schedule and advance mobility in the Golden State. AN - dot:89722 ET - Research Brief KW - High speed rail KW - Passenger trains KW - Railroad transportation KW - Lessons learned KW - Property acquisition KW - Interviewing KW - Land KW - Financing KW - Bridges KW - Highways KW - Costs KW - Legislation LA - English PB - San Jose State University. College of Business. Mineta Transportation Institute PY - 2026-03-01 SN - 2470 TI - What Holds High-Speed Rail Back: Lessons From Global Systems and California’s Experience [Research Brief] M3 - Brief N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89722 ER -
Highway Construction Workforce Partnership: Strategic Workforce Development: Training Tomorrow's Highway Construction Leaders

United States. Department of Transportation. Federal Highway Administration

2021-08-11 | PDF

Building a strong, capable highway construction workforce that supports the nation's transportation industry and drives the economy forward requires a solid foundation. The U.S. Department of Transportation’s Federal Highway Administration (FHWA) established the Highway Construction Workforce Partnership (HCWP) to help train qualified individuals a ...

03/30/2026

Title : Highway Construction Workforce Partnership: Strategic Workforce Development: Training Tomorrow's Highway Construction Leaders Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Contributor(s) : Chong, Michael;Foster, Corey;Albright, James;Chavez, Robert;Bird, Patty;Gottschalk, Bob; Published Date : 2021-08-11 URL : https://rosap.ntl.bts.gov/view/dot/89721 United States. Department of Transportation. Federal Highway Administration (2021). Highway Construction Workforce Partnership: Strategic Workforce Development: Training Tomorrow's Highway Construction Leaders. United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Training Tomorrow's Highway Construction Leaders" (2021) United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Training Tomorrow's Highway Construction Leaders" , 2021 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A4 - Chong, Michael A4 - Foster, Corey A4 - Albright, James A4 - Chavez, Robert A4 - Bird, Patty A4 - Gottschalk, Bob AB - Building a strong, capable highway construction workforce that supports the nation's transportation industry and drives the economy forward requires a solid foundation. The U.S. Department of Transportation’s Federal Highway Administration (FHWA) established the Highway Construction Workforce Partnership (HCWP) to help train qualified individuals and place them into needed roles. HCWPs in Arizona, Los Angeles, Pittsburgh, and Rhode Island are teaming up with organizations like the National Center for Construction Education & Research (NCCER) and the Pittsburgh Job Corps Center to prepare tomorrow’s workforce to excel in highway construction apprenticeship programs that launch lasting careers. AN - dot:89721 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: Training Tomorrow's Highway Construction Leaders M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89721 ER -
Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations

Jacobson, Mark Z. ;

Lele, Sanjiva K.

2016-12-15 | PDF

As the popularity of and global access to air travel expands, quantifying its impact on climate and air pollution becomes increasingly important. However, the spatial-temporal distribution of aircraft emissions and their byproducts span many orders of magnitude, as contrail development begins within seconds, but can spread to the kilometer-scale an ...

03/30/2026

Title : Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations Creator(s) : Jacobson, Mark Z.;Lele, Sanjiva K.; Corporate Creator(s) : Stanford University 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 : 2016-12-15 URL : https://rosap.ntl.bts.gov/view/dot/89720 Jacobson, Mark Z. and Lele, Sanjiva K. (2016). Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations. Jacobson, Mark Z. and Lele, Sanjiva K. "Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations" (2016) Jacobson, Mark Z. and Lele, Sanjiva K. "Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations" , 2016 Export RIS Citation Information. TY - Tech Report AU - Jacobson, Mark Z. AU - Lele, Sanjiva K. A2 - Stanford University 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 - As the popularity of and global access to air travel expands, quantifying its impact on climate and air pollution becomes increasingly important. However, the spatial-temporal distribution of aircraft emissions and their byproducts span many orders of magnitude, as contrail development begins within seconds, but can spread to the kilometer-scale and persist for hours. The wide range of spatial and temporal scales makes it difficult to obtain detailed knowledge of the composition and evolution of emissions from measurements or modeling studies alone. In an attempt to increase understanding, this project simulates the short-term, near- and far-field evolution of aircraft exhaust aerosol and contrail particles and gases with two computer models: GATOR-GCMOM and an LES model. Together, these two models simulate phenomena spanning a spatial range from millimeters to thousands of kilometers. Detailed microphysical processes in the models are validated and improved with field measurements from NASA’s ACCESS-2 campaign, so that the models may provide more credible estimates of impacts on climate and atmospheric composition when used at the regional and global scale. AN - dot:89720 ET - Final Report KW - Pollutants KW - Aircraft exhaust gases KW - Environmental impacts KW - Environmental impact analysis KW - ASCENT LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2016-12-15 TI - Microphysical Modeling & Analysis of ACCESS 2 Aviation Exhaust Observations M3 - Tech Report N1 - United States N1 - 13-C-AJFE-SU-002 UR - https://rosap.ntl.bts.gov/view/dot/89720 ER -
Evaluation of Wind-Loading on Airport Signs

Bagot, Keith

2000-06-01 | PDF

Airport signs at certain critical locations at O’Hare International Airport and other major U.S. airports are being sheared off their mounting legs at the frangible coupling from aircraft jet engine blast and/or wake turbulence forces. his damage to the sign increases the chance of foreign object damage (FOD) as well as the loss of visual guidance ...

03/30/2026

Title : Evaluation of Wind-Loading on Airport Signs Creator(s) : Bagot, Keith Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research Published Date : 2000-06-01 Report Number : DOT/FAA/AR-TN00/32 URL : https://rosap.ntl.bts.gov/view/dot/89719 Bagot, Keith (2000). Evaluation of Wind-Loading on Airport Signs. Bagot, Keith "Evaluation of Wind-Loading on Airport Signs" (2000) Bagot, Keith "Evaluation of Wind-Loading on Airport Signs" , 2000 Export RIS Citation Information. TY - Tech Report AU - Bagot, Keith A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research AB - Airport signs at certain critical locations at O’Hare International Airport and other major U.S. airports are being sheared off their mounting legs at the frangible coupling from aircraft jet engine blast and/or wake turbulence forces. his damage to the sign increases the chance of foreign object damage (FOD) as well as the loss of visual guidance for other aircraft. here is a need to better understand and more precisely determine the forces on the signs at these locations. The results of this testing indicated that the current frangibility design criteria is not adequate for airport signs installed on airports that service large transport aircraft. modification to the frangibility requirements or a maximum setback distance would appear to be a satisfactory solution to mitigate sign breakage. he former is recommended since it would appear to have no impact on the operational characteristics of the aircraft movement area. AN - dot:89719 ET - Technical Note KW - Airport surface traffic control KW - Design KW - Jet engines KW - Sign supports KW - Signs KW - Visual aids LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 2000-06-01 SN - DOT/FAA/AR-TN00/32 TI - Evaluation of Wind-Loading on Airport Signs M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89719 ER -
Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems

United States. Department of Transportation. Federal Highway Administration

2025-09-10 | PDF

Advanced Digital Construction Management Systems (ADCMS) are an important part of the Federal Highway Administration’s (FHWA) ongoing, strategic effort to share innovative project delivery practices with State and other transportation agencies. ADCMS are technologies and processes that include systems for infrastructure planning and coordination, d ...

03/30/2026

Title : Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Contributor(s) : Currier, Chrisy Published Date : 2025-09-10 URL : https://rosap.ntl.bts.gov/view/dot/89718 United States. Department of Transportation. Federal Highway Administration (2025). Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems. United States. Department of Transportation. Federal Highway Administration "Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems" (2025) United States. Department of Transportation. Federal Highway Administration "Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems" , 2025 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A4 - Currier, Chrisy AB - Advanced Digital Construction Management Systems (ADCMS) are an important part of the Federal Highway Administration’s (FHWA) ongoing, strategic effort to share innovative project delivery practices with State and other transportation agencies. ADCMS are technologies and processes that include systems for infrastructure planning and coordination, design, construction, maintenance, modernization and management, and asset management. Through its ADCMS Program, FHWA offers grants to help State departments of transportation (DOT) adopt advanced technology that can be used throughout various parts of the construction lifecycle. AN - dot:89718 KW - Infrastructure KW - Construction management KW - Project delivery KW - Transportation planning LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2025-09-10 TI - Strategic Workforce Development: Case Study: Focus on Innovation: Advanced Digital Construction Management Systems M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89718 ER -
Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce

United States. Department of Transportation. Federal Highway Administration

2021-06-30 | PDF

Across the nation, there is a shortage of highway construction workers, who keep the transportation industry and economy moving forward. The U.S. Department of Transportation's Federal Highway Administration (FHWA) partnered with other key national highway organizations and the Employment and Training Administration to establish the Highway Constru ...

03/30/2026

Title : Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Contributor(s) : Pavlik, Monica;Chong, Michael;James, Stephanie;Caliendo, Michael; Published Date : 2021-06-30 URL : https://rosap.ntl.bts.gov/view/dot/89717 United States. Department of Transportation. Federal Highway Administration (2021). Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce. United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce" (2021) United States. Department of Transportation. Federal Highway Administration "Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce" , 2021 Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A4 - Pavlik, Monica A4 - Chong, Michael A4 - James, Stephanie A4 - Caliendo, Michael AB - Across the nation, there is a shortage of highway construction workers, who keep the transportation industry and economy moving forward. The U.S. Department of Transportation's Federal Highway Administration (FHWA) partnered with other key national highway organizations and the Employment and Training Administration to establish the Highway Construction Workforce Partnership (HCWP). The partnership brings highway construction, education, and workforce interests together at state and local levels to identify, train, and place individuals into trade occupations to fill industry workforce gaps. The programs are managed by the partner working groups that identify workforce needs and resources. HCWPs in Alabama, Denver, Idaho, and Rhode Island have launched successful working groups. AN - dot:89717 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 - 2021-06-30 TI - Highway Construction Workforce Partnership: Strategic Workforce Development: Regional Working Groups Collaborate to Combat Shortages in Highway Construction Workforce M3 - Brief N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/89717 ER -
Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing

Packer, Alden ;

Reimann, C. Aaron

2025-08-01 | PDF

Acoustic liners are integral to the noise management of aircraft engines. As such, acoustic liner designs and configurations are the subject of research and development to address the acoustic requirements of novel engine layouts. Perforate sheet over honeycomb core, or single degree of freedom (SDOF), liners are the traditional system that has bee ...

03/30/2026

Title : Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing Creator(s) : Packer, Alden;Reimann, C. Aaron;Winkler, Julian;Homma, Kenji;Mendoza, Jeffrey;Greenwood, Eric;Manahan, Michael;Meisel, Nicholas; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Pennsylvania State University; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2025-08-01 Report Number : Packer_SFF_2025 URL : https://rosap.ntl.bts.gov/view/dot/89716 Packer, Alden et al. (2025). Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing. Packer, Alden et al. "Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing" (2025) Packer, Alden et al. "Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing" , 2025 Export RIS Citation Information. TY - Proceedings AU - Packer, Alden AU - Reimann, C. Aaron AU - Winkler, Julian AU - Homma, Kenji AU - Mendoza, Jeffrey AU - Greenwood, Eric AU - Manahan, Michael AU - Meisel, Nicholas A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Pennsylvania State University A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - Acoustic liners are integral to the noise management of aircraft engines. As such, acoustic liner designs and configurations are the subject of research and development to address the acoustic requirements of novel engine layouts. Perforate sheet over honeycomb core, or single degree of freedom (SDOF), liners are the traditional system that has been used in the past, while more advanced double degree of freedom (DDOF) liners are the state-of-the-art liners currently implemented in aircraft engines. Leveraging the design freedom of additive manufacturing, our current research explores the use of TPMS lattice structures as an advanced core structure for acoustic liners. In this study, previously developed design exploration methods have been implemented to compare the performance of novel TPMS acoustic liners with the SDOF and DDOF liners. Performance comparisons between the acoustic liner types demonstrate the viability of the TPMS lattice liner as a viable alternative to standard designs, meriting further refinement and exploration. AN - dot:89716 KW - Acoustics KW - Three dimensional printing KW - Noise control KW - Aviation KW - Manufacturing KW - ASCENT KW - Additive manufacturing LA - English PB - The Minerals, Metals & Materials Society (TMS) PY - 2025-08-01 SN - Packer_SFF_2025 TI - Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing M3 - Proceedings N1 - United States N1 - 13-C-AJFE-PSU-113 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89716 ER -
Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development

Shrestha, K. Joseph ;

Uddin, Mohammad Moin

2025-08-01 | PDF

Accurate preliminary cost estimates for resurfacing projects are essential to conduct a reliable Maintenance & Rehabilitation (M&R) analysis, prioritize projects, and optimize the use of available budget. However, TDOT is currently using an outdated cost per lane mile data for such analysis, and hence the results of such analysis can be less reliab ...

03/30/2026

Title : Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development Creator(s) : Shrestha, K. Joseph;Uddin, Mohammad Moin;Iyiola, David;Paul, Pritom; Corporate Creator(s) : East Tennessee State University Corporate Contributor(s) : Tennessee. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-08-01 Report Number : RES2024-08 URL : https://rosap.ntl.bts.gov/view/dot/89715 Shrestha, K. Joseph et al. (2025). Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development. Shrestha, K. Joseph et al. "Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development" (2025) Shrestha, K. Joseph et al. "Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development" , 2025 Export RIS Citation Information. TY - Tech Report AU - Shrestha, K. Joseph AU - Uddin, Mohammad Moin AU - Iyiola, David AU - Paul, Pritom A2 - East Tennessee State University A3 - Tennessee. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Accurate preliminary cost estimates for resurfacing projects are essential to conduct a reliable Maintenance & Rehabilitation (M&R) analysis, prioritize projects, and optimize the use of available budget. However, TDOT is currently using an outdated cost per lane mile data for such analysis, and hence the results of such analysis can be less reliable. To address the issue, this study develops a framework and a tangible tool entitled “Resurfacing Cost Prediction (RCP).” This framework and tool require limited project characteristics, such as, project length and location, that are available at the early phase of project development. The validation of the tool achieved 100% compliance for accuracy based on AASHTO Practical Guide for Cost Estimation for three treatment types for planning phase. The study also addresses another issue related to project bundling. TDOT creates bundles of resurfacing projects to attract more contractors, achieve lower cost per lane mile, and reduce administrative burden. However, TDOT lacks a systematic methodology to create project bundles. As such, it relies on manual identification of projects suitable for bundling. This manual approach can be very time-consuming and cumbersome, and it can create inconsistent bundles. To address this issue, an Automated Maintenance Project Bundling (AMPB) tool is developed. The tool was able to achieve up to 92% accuracy in correctly identifying if a project should be bundled or not. These frameworks and tools are expected to aid TDOT in improving the planning and execution of resurfacing projects while optimizing the use of available budget. AN - dot:89715 ET - Final Report: August 2023 - September 2025 KW - Cost estimating KW - Construction projects KW - Evaluation KW - Project management KW - Maintenance KW - Rehabilitation KW - Planning KW - Methodology KW - Cost-estimating-models KW - construction-project-bundling KW - cost-prediction KW - compatibility-scores LA - English PB - Tennessee. Department of Transportation PY - 2025-08-01 SN - RES2024-08 TI - Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89715 ER -
Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development

Mavris, Dimitri N.

;

Kirby, Michelle R.

2020-03-01 | PDF

Accurate modeling of aircraft performance is a key factor in estimating aircraft noise, emissions, and fuel burn. Within the Aviation Environmental Design Tool (AEDT), many assumptions are made for aircraft performance modeling with respect to aircraft weight and departure procedure, coupled with aircraft departure typically being modeled by assumi ...

03/30/2026

Title : Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development Creator(s) : Mavris, Dimitri N.;Kirby, Michelle R.;Li, Yongchang;Puranik, Tejas;Lim, Don;Gao, Zhenyu;Jin, Yee Chan;Monteiro, Dylan;Gabrielian, Ana;Isakson, Loren; Corporate Creator(s) : Georgia Institute of Technology. School of Aerospace Engineering 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 : 2020-03-01 URL : https://rosap.ntl.bts.gov/view/dot/89714 Mavris, Dimitri N. et al. (2020). Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development. Mavris, Dimitri N. et al. "Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development" (2020) Mavris, Dimitri N. et al. "Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development" , 2020 Export RIS Citation Information. TY - Tech Report AU - Mavris, Dimitri N. AU - Kirby, Michelle R. AU - Li, Yongchang AU - Puranik, Tejas AU - Lim, Don AU - Gao, Zhenyu AU - Jin, Yee Chan AU - Monteiro, Dylan AU - Gabrielian, Ana AU - Isakson, Loren A2 - Georgia Institute of Technology. School of Aerospace Engineering 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 - Accurate modeling of aircraft performance is a key factor in estimating aircraft noise, emissions, and fuel burn. Within the Aviation Environmental Design Tool (AEDT), many assumptions are made for aircraft performance modeling with respect to aircraft weight and departure procedure, coupled with aircraft departure typically being modeled by assuming that full rated takeoff power/thrust is used. As operations around airports continue to evolve, there is a need to examine those assumptions and to improve the modeling accuracy with flight data. In recent years, flight data are increasingly being used to enhance models and bring model estimation even closer to reality. Research is needed to build on prior work with a view to develop a robust set of recommendations for improved estimation processes for takeoff weight, reduced thrust takeoffs, and departure profiles within AEDT. During this project, the research provided the FAA with recommendations and an implementation plan to improve the takeoff performance modeling based on real world observations, which ultimately was included in the public release of AEDT3b. AN - dot:89714 KW - Aircraft noise KW - Aircraft operations KW - Fuel consumption KW - Pollutants KW - Software KW - Uncertainty KW - Validation KW - ASCENT LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment PY - 2020-03-01 TI - Project 045 Takeoff/Climb Analysis to Support AEDT Aircraft Performance Model (APM) Development M3 - Tech Report N1 - United States N1 - 13-C-AJFE-GIT-020 UR - https://rosap.ntl.bts.gov/view/dot/89714 ER -
Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities

Abadi, Masoud Ghodrat ;

Zandiatashbar, Ahoura

2026-03-01 | PDF

Access to healthcare is a key component of public health equity, yet many U.S. communities remain dependent on private vehicles for medical travel. This study introduces an integrated framework, the Transit+Walk Score (TWS), to evaluate how effectively residents of Sacramento, California, can reach healthcare facilities via public transit and how s ...

03/30/2026

Title : Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities Creator(s) : Abadi, Masoud Ghodrat;Zandiatashbar, Ahoura;Pickett, Aaron;Nemett, Stephanie;Sharifi, Soheil; Corporate Creator(s) : San Jose State University. College of Business. Mineta Transportation Institute Corporate Contributor(s) : State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration;United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology; Published Date : 2026-03-01 Report Number : 26-05 DOI : https://doi.org/10.31979/mti.2026.2509 Abadi, Masoud Ghodrat et al. (2026). Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities. https://doi.org/10.31979/mti.2026.2509 Abadi, Masoud Ghodrat et al. "Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities" (2026), https://doi.org/10.31979/mti.2026.2509 Abadi, Masoud Ghodrat et al. "Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities" , 2026, https://doi.org/10.31979/mti.2026.2509 Export RIS Citation Information. TY - Tech Report AU - Abadi, Masoud Ghodrat AU - Zandiatashbar, Ahoura AU - Pickett, Aaron AU - Nemett, Stephanie AU - Sharifi, Soheil A2 - San Jose State University. College of Business. Mineta Transportation Institute A3 - State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration A3 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology AB - Access to healthcare is a key component of public health equity, yet many U.S. communities remain dependent on private vehicles for medical travel. This study introduces an integrated framework, the Transit+Walk Score (TWS), to evaluate how effectively residents of Sacramento, California, can reach healthcare facilities via public transit and how safely, comfortably, and conveniently they can walk from transit stops to those facilities. The research aims to inform planners, transit agencies, and policymakers in designing equitable and multimodal transportation systems. The research team combined geospatial network modeling and field-based walkability audits to assess 123 healthcare facilities across Sacramento, with 56 sites selected for detailed evaluation using the Pedestrian Environment Data Scan (PEDS) tool. The TWS integrated modeled transit travel times with on-the-ground walkability data to identify areas of high and low accessibility. Findings revealed that Downtown, Midtown, and East Sacramento exhibited the highest multimodal accessibility, while northern Arden-Arcade and outer suburban areas demonstrated the lowest. Educational attainment emerged as the strongest predictor of accessibility, highlighting structural inequities in pedestrian and transit infrastructure. The study concludes that equitable healthcare access requires both reliable transit and safe, continuous pedestrian networks. The TWS offers a scalable, data-driven tool to guide future investments that advance health equity, sustainable transportation, and inclusive community design. AN - dot:89713 DO - https://doi.org/10.31979/mti.2026.2509 KW - Public transit KW - Walkability KW - Health care facilities KW - Access KW - Transportation equity KW - Residents KW - Pedestrians KW - Multimodal transportation KW - Transit operating agencies KW - Pedestrian safety KW - Data analysis KW - Planning KW - Geospatial data KW - Evaluation LA - English PB - San Jose State University. College of Business. Mineta Transportation Institute PY - 2026-03-01 SN - 26-05 TI - Equity Evaluation of Residents’ Transit + Walk Accessibility to Sacramento Healthcare Facilities M3 - Tech Report N1 - United States N1 - SB1-SJAUX_2023-26 UR - https://rosap.ntl.bts.gov/view/dot/89713 ER -
Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief]

Abadi, Masoud Ghodrat ;

Zandiatashbar, Ahoura

2026-03-01 | PDF

A visit to almost any healthcare facility in the U.S. reveals a familiar sight: vast parking lots built for cars. This reflects a deeper reality that almost 9 out of 10 healthcare trips in the U.S. rely on private automobiles. Yet this car-dependent model creates serious challenges for people who cannot drive, including many older adults, people wi ...

03/30/2026

Title : Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief] Creator(s) : Abadi, Masoud Ghodrat;Zandiatashbar, Ahoura;Pickett, Aaron;Nemett, Stephanie;Sharifi, Soheil; Corporate Creator(s) : San Jose State University. College of Business. Mineta Transportation Institute;California State University Sacramento; Corporate Contributor(s) : State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration;United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology;United States. Department of Transportation. University Transportation Centers (UTC) Program; Published Date : 2026-03-01 Report Number : 2509 URL : https://rosap.ntl.bts.gov/view/dot/89712 Abadi, Masoud Ghodrat et al. (2026). Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief]. Abadi, Masoud Ghodrat et al. "Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief]" (2026) Abadi, Masoud Ghodrat et al. "Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief]" , 2026 Export RIS Citation Information. TY - Brief AU - Abadi, Masoud Ghodrat AU - Zandiatashbar, Ahoura AU - Pickett, Aaron AU - Nemett, Stephanie AU - Sharifi, Soheil A2 - San Jose State University. College of Business. Mineta Transportation Institute A2 - California State University Sacramento A3 - State of California SB1 2017/2018, Trustees of the California State University Sponsored Programs Administration A3 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology A3 - United States. Department of Transportation. University Transportation Centers (UTC) Program AB - A visit to almost any healthcare facility in the U.S. reveals a familiar sight: vast parking lots built for cars. This reflects a deeper reality that almost 9 out of 10 healthcare trips in the U.S. rely on private automobiles. Yet this car-dependent model creates serious challenges for people who cannot drive, including many older adults, people with disabilities, and low-income households. For millions of Americans, transportation barriers delay or prevent access to essential medical care. This project asks a simple but powerful question: without a car, how accessible are healthcare facilities? Focusing on Sacramento, California, the study examines whether public transit and walking infrastructure together provide equitable access to healthcare, particularly for transit dependent and underserved communities. To answer this question, the research introduces a new multimodal metric, the Transit+ Walk Score (TWS), which combines transit accessibility and pedestrian walkability. By evaluating healthcare access through a non-automobile lens, this study reframes transportation planning as both an equity issue and a public health opportunity. AN - dot:89712 ET - Research Brief KW - Public transit KW - Walkability KW - Health care facilities KW - Access KW - Transportation equity KW - Residents KW - Pedestrians KW - Multimodal transportation KW - Transit operating agencies KW - Pedestrian safety KW - Data analysis KW - Planning KW - Geospatial data KW - Evaluation LA - English PB - San Jose State University. College of Business. Mineta Transportation Institute PY - 2026-03-01 SN - 2509 TI - Equity Evaluation of Residents’ Transit+Walk Accessibility to Sacramento Healthcare Facilities [Research Brief] M3 - Brief N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89712 ER -
Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft

Gonzalez, Victoria

;

Yeung, Seraphin H.

2025-12-01 | PDF

A broad range of AAM aircraft are currently in development, each with varying community noise footprints and energy consumption depending on the specifics of their departure and arrival flight trajectories, which must be understood for effective airspace integration. This work presents a framework for analyzing AAM trajectory design, focusing on ke ...

03/30/2026

Title : Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft Creator(s) : Gonzalez, Victoria;Yeung, Seraphin H.;Huynh, Jacqueline L.;Hansman, R. John; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment;Massachusetts Institute of Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy Published Date : 2025-12-01 Report Number : eScholarship UC item 761269mb DOI : https://doi.org/10.2514/1.c038248 Gonzalez, Victoria et al. (2025). Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft. https://doi.org/10.2514/1.c038248 Gonzalez, Victoria et al. "Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft" (2025), https://doi.org/10.2514/1.c038248 Gonzalez, Victoria et al. "Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft" , 2025, https://doi.org/10.2514/1.c038248 Export RIS Citation Information. TY - Journal Article AU - Gonzalez, Victoria AU - Yeung, Seraphin H. AU - Huynh, Jacqueline L. AU - Hansman, R. John A2 - United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment A2 - Massachusetts Institute of Technology A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy AB - A broad range of AAM aircraft are currently in development, each with varying community noise footprints and energy consumption depending on the specifics of their departure and arrival flight trajectories, which must be understood for effective airspace integration. This work presents a framework for analyzing AAM trajectory design, focusing on key performance characteristics including community noise impact, energy consumption, and flight duration. The framework can be applied to diverse AAM vehicle types, as demonstrated in this work on a Blown-Flap Short Takeoff and Landing vehicle, a Tilt-Rotor Vertical Takeoff and Landing vehicle, and a Lift plus Cruise Vertical Takeoff and Landing vehicle. Results of comparing various takeoff procedures for each vehicle show trade-offs between community noise, energy consumption, and flight duration, highlighting the importance of strategic trajectory design. 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: Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft Victoria Gonzalez, Seraphin Yeung, Jacqueline Huynh, and R. John Hansman Journal of Aircraft 0 0:0, 1-16. https://doi.org/10.2514/1.c038248 AN - dot:89711 DO - https://doi.org/10.2514/1.c038248 KW - Flight paths KW - Aircraft KW - Mobility KW - Rotor blades KW - Flight control systems KW - VTOL aircraft KW - Energy consumption KW - STOL aircraft KW - Airspace KW - ASCENT LA - English PB - American Institute of Aeronautics and Astronautics PY - 2025-12-01 SN - eScholarship UC item 761269mb TI - Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft M3 - Journal Article N1 - United States N1 - 13-C-AJFE-MIT-112, 131 N1 - Open Access; https://creativecommons.org/licenses/by/4.0/ UR - https://rosap.ntl.bts.gov/view/dot/89711 ER -
Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970

Villarreal, Carlos C.

1970-01-01 | PDF

Carlos C. (“C. C.”) Villarreal (1924-2010) served as the U.S. Department of Transportation’s Urban Mass Transportation Administrator (now the Federal Transit Administration) from 1969 to 1973. Before joining DOT, he worked as Vice-President for the Marquardt Corporation and served in the Navy from 1948 to 1957.

03/27/2026

Title : Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970 Creator(s) : Villarreal, Carlos C. Corporate Creator(s) : United States. Department of Transportation. Urban Mass Transportation Administration Published Date : 1970-01-01 DOI : https://doi.org/10.21949/dmxa-d939 Villarreal, Carlos C. (1970). Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970. https://doi.org/10.21949/dmxa-d939 Villarreal, Carlos C. "Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970" (1970), https://doi.org/10.21949/dmxa-d939 Villarreal, Carlos C. "Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970" , 1970, https://doi.org/10.21949/dmxa-d939 Export RIS Citation Information. TY - Speeches AU - Villarreal, Carlos C. A2 - United States. Department of Transportation. Urban Mass Transportation Administration AB - Carlos C. (“C. C.”) Villarreal (1924-2010) served as the U.S. Department of Transportation’s Urban Mass Transportation Administrator (now the Federal Transit Administration) from 1969 to 1973. Before joining DOT, he worked as Vice-President for the Marquardt Corporation and served in the Navy from 1948 to 1957. AN - dot:89710 DO - https://doi.org/10.21949/dmxa-d939 KW - Transportation policy KW - Public transit KW - Highway safety KW - Transportation safety KW - Traffic safety LA - English PB - United States. Department of Transportation PY - 1970-01-01 TI - Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator: 1970 M3 - Speeches N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89710 ER -
Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969

Villarreal, Carlos C.

1969-01-01 | PDF

Carlos C. (“C. C.”) Villarreal (1924-2010) served as the U.S. Department of Transportation’s Urban Mass Transportation Administrator (now the Federal Transit Administration) from 1969 to 1973. Before joining DOT, he worked as Vice-President for the Marquardt Corporation and served in the Navy from 1948 to 1957.

03/27/2026

Title : Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969 Creator(s) : Villarreal, Carlos C. Corporate Creator(s) : United States. Department of Transportation. Urban Mass Transportation Administration Published Date : 1969-01-01 DOI : https://doi.org/10.21949/tsk4-q205 Villarreal, Carlos C. (1969). Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969. https://doi.org/10.21949/tsk4-q205 Villarreal, Carlos C. "Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969" (1969), https://doi.org/10.21949/tsk4-q205 Villarreal, Carlos C. "Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969" , 1969, https://doi.org/10.21949/tsk4-q205 Export RIS Citation Information. TY - Speeches AU - Villarreal, Carlos C. A2 - United States. Department of Transportation. Urban Mass Transportation Administration AB - Carlos C. (“C. C.”) Villarreal (1924-2010) served as the U.S. Department of Transportation’s Urban Mass Transportation Administrator (now the Federal Transit Administration) from 1969 to 1973. Before joining DOT, he worked as Vice-President for the Marquardt Corporation and served in the Navy from 1948 to 1957. AN - dot:89709 DO - https://doi.org/10.21949/tsk4-q205 KW - Transportation policy KW - Public transit KW - Highway safety KW - Transportation safety KW - Traffic safety LA - English PB - United States. Department of Transportation PY - 1969-01-01 TI - Speeches by Carlos C. Villarreal, Urban Mass Transportation Administrator:1969 M3 - Speeches N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/89709 ER -

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