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Showing 361 - 380 of 475 results

Residual Strength of Full-Depth Reclamation

Torres-Machi, Cristina ;

Beesam, Vishwa Vignan

2020-07-01 | PDF

Cold recycling technologies such as Full-Depth Reclamation (FDR) are sustainable and cost-effective techniques for pavement rehabilitation. Previous research has found current mechanistic-empirical (M-E) default values to be non representative and overly conservative, leading to an underestimation of the true performance capabilities of FDR materia ...

01/20/2026

Title : Residual Strength of Full-Depth Reclamation Creator(s) : Torres-Machi, Cristina;Beesam, Vishwa Vignan;Galotti, Victor; Corporate Creator(s) : University of Colorado Boulder Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-07-01 Report Number : CDOT-2020-09 URL : https://rosap.ntl.bts.gov/view/dot/88630 Torres-Machi, Cristina et al. (2020). Residual Strength of Full-Depth Reclamation. Torres-Machi, Cristina and Beesam, Vishwa Vignan and Galotti, Victor "Residual Strength of Full-Depth Reclamation" (2020) Torres-Machi, Cristina et al. "Residual Strength of Full-Depth Reclamation" , 2020 Export RIS Citation Information. TY - Tech Report AU - Torres-Machi, Cristina AU - Beesam, Vishwa Vignan AU - Galotti, Victor A2 - University of Colorado Boulder A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - Cold recycling technologies such as Full-Depth Reclamation (FDR) are sustainable and cost-effective techniques for pavement rehabilitation. Previous research has found current mechanistic-empirical (M-E) default values to be non representative and overly conservative, leading to an underestimation of the true performance capabilities of FDR materials. To address this gap, this research analyzes the performance of 11 FDR sites constructed throughout Colorado and compares their long-term performance with M-E predictions. The objective of this report is to recommend input values for the M-E design of FDR base materials that result in reliable predictions of FDR long-term performance. Both initial values of the International Roughness Index (IRI) and resilient modulus were found to have a significant impact on M-E predictions and were calibrated in a two-step process. The proposed input parameters lead to a conservative design of FDR projects and result in improved IRI predictions than the ones derived from current design criteria. With the current design parameters, IRI predictions were on average overestimated by 51 in/ mile, whereas the proposed input parameters allow to reduce this difference to 17 in/mile. Future research is needed to improve current models in M-E pavement design software to adequately model cold-in-place recycled layers such as FDR. AN - dot:88630 ET - Final Report KW - Modulus of resilience KW - Mechanistic-empirical pavement design KW - Performance KW - Full-depth reclamation KW - Roughness KW - Cost effectiveness KW - Cold in-place recycling KW - Pavement design KW - Long-term performance LA - English PB - Colorado Department of Transportation. Applied Research & Innovations Branch PY - 2020-07-01 SN - CDOT-2020-09 TI - Residual Strength of Full-Depth Reclamation M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88630 ER -
Construction and Design Soil Property Correlation

Fragomeni, Cara ;

Hedayat, Ahmadreza

2020-07-01 | PDF

The main goal of this research study was to develop correlations among R-value, resilient modulus, and soil’s basic properties for available AASHTO soil types in databases in Colorado. In this study, an extensive database of systematically conducted resilient modulus and R-value tests along with the basic soil properties for Colorado soils was esta ...

01/20/2026

Title : Construction and Design Soil Property Correlation Creator(s) : Fragomeni, Cara;Hedayat, Ahmadreza; Corporate Creator(s) : Colorado School of Mines Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-07-01 Report Number : CDOT-2020-10 URL : https://rosap.ntl.bts.gov/view/dot/88629 Fragomeni, Cara and Hedayat, Ahmadreza (2020). Construction and Design Soil Property Correlation. Fragomeni, Cara and Hedayat, Ahmadreza "Construction and Design Soil Property Correlation" (2020) Fragomeni, Cara and Hedayat, Ahmadreza "Construction and Design Soil Property Correlation" , 2020 Export RIS Citation Information. TY - Tech Report AU - Fragomeni, Cara AU - Hedayat, Ahmadreza A2 - Colorado School of Mines A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - The main goal of this research study was to develop correlations among R-value, resilient modulus, and soil’s basic properties for available AASHTO soil types in databases in Colorado. In this study, an extensive database of systematically conducted resilient modulus and R-value tests along with the basic soil properties for Colorado soils was established. The R-value test database was developed by acquiring and analyzing many soil reports with R-value tests performed by CDOT.A multiple regression analysis was performed to correlate the R-value as the dependent variable with the fundamental soil properties as the independent variables. The resilient modulus database was developed by evaluating the test results of over200 previously conducted tests. The MEPDG-adopted generalized resilient modulus model was used in the statistic analysis and correlations were developed for estimating the resilient modulus model parameters ki based on the soil index properties. Because the previously conducted resilient modulus tests did not have all of the needed accompanying soil index test results, AASHTO soil type A-2-4 was selected as the target soil type for a more detailed and systematic testing and regression analysis. Thirty specimens of A-2-4 soil type were collected and tested for resilient modulus, R-value, and their basic physical properties through tests such as the sieve analysis, hydrometer testing, standard Proctor test, and Atterberg limits. A multiple regression analysis and stepwise regression analysis were performed to correlate the experimentally measured resilient modulus values with the fundamental soil properties; and the verified regression models for the A-2-4soil type were shown in this study to provide superior performance over the existing published models. Implementation Based on the results of this research study, several regression models were developed to be used for estimation of the R-value for AASHTO soil types A-1-a, A-1-b, A-2-4, A-2-6, A-2-7, A-4, A-6, and A-7-6. In addition, regression models for prediction of resilient modulus for AASHTO soil types A-2-4 were presented in this study. The same testing program and regression methodology can be applied to other soil types of interest. AN - dot:88629 ET - Final Report KW - Modulus of elasticity KW - Regression analysis KW - Soils by properties KW - Construction KW - Correlation analysis KW - Databases KW - Modulus of resilience KW - Testing KW - R-value KW - Colorado soils KW - A-2-4 soil LA - English PB - Colorado Department of Transportation. Applied Research & Innovations Branch PY - 2020-07-01 SN - CDOT-2020-10 TI - Construction and Design Soil Property Correlation M3 - Tech Report N1 - United States N1 - 418.01 UR - https://rosap.ntl.bts.gov/view/dot/88629 ER -
Development of Equipment Rental Schedule for Illinois

Bian, Zheyong

;

Dong, Zhijie

2026-01-01 | PDF

During highway construction, the Illinois Department of Transportation (IDOT) resident engineer commonly adds “extra work” to the contract as needed for satisfactory completion of the project. One of the formats for contractor reimbursement requires establishing an hourly compensation rate for contractor-owned equipment used to perform the extra wo ...

01/20/2026

Title : Development of Equipment Rental Schedule for Illinois Creator(s) : Bian, Zheyong;Dong, Zhijie;Kesagani, Revanth;Yang, Haowei;Alam, A. K. M. Sazzadul; Corporate Creator(s) : Illinois Center for Transportation Corporate Contributor(s) : Illinois. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-01-01 Report Number : FHWA-ICT-26-001 URL : https://rosap.ntl.bts.gov/view/dot/88628 Bian, Zheyong et al. (2026). Development of Equipment Rental Schedule for Illinois. Bian, Zheyong et al. "Development of Equipment Rental Schedule for Illinois" (2026) Bian, Zheyong et al. "Development of Equipment Rental Schedule for Illinois" , 2026 Export RIS Citation Information. TY - Tech Report AU - Bian, Zheyong AU - Dong, Zhijie AU - Kesagani, Revanth AU - Yang, Haowei AU - Alam, A. K. M. Sazzadul A2 - Illinois Center for Transportation A3 - Illinois. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - During highway construction, the Illinois Department of Transportation (IDOT) resident engineer commonly adds “extra work” to the contract as needed for satisfactory completion of the project. One of the formats for contractor reimbursement requires establishing an hourly compensation rate for contractor-owned equipment used to perform the extra work and similar equipment owned by local agencies eligible for Motor Fuel Tax funding. Construction equipment rental rates vary widely according to factors, including equipment age, type, overhaul labor and parts, field labor and parts, capacity, estimated operating costs, availability, the geographic and climatic conditions at the job site, etc. It is critical that each highway agency, including IDOT, establish specific policies and standard guidelines to deal with construction equipment reimbursement in force account work in a fair manner to contractors. This project develops a comprehensive equipment rate schedule model to establish hourly compensation rates for contractor-owned equipment used in performing extra work. The model incorporates ownership costs—such as depreciation, overhead, and overhaul costs—and operating costs, including fuel, tire, and lubrication expenses. A methodology for annual rate updates is also developed. Additionally, the project delivers a user-friendly, web-based tool that can be operated and maintained by IDOT. AN - dot:88628 ET - Final Report: 8/16/22–1/15/26 KW - Transportation KW - Equipment KW - Property management KW - Costs KW - Fuel taxes KW - Cost estimating KW - Construction management KW - Scheduling KW - Contractors KW - Rates KW - Rent LA - English PB - Illinois. Department of Transportation PY - 2026-01-01 SN - FHWA-ICT-26-001 TI - Development of Equipment Rental Schedule for Illinois M3 - Tech Report N1 - United States N1 - R27-254 UR - https://rosap.ntl.bts.gov/view/dot/88628 ER -
Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs

Kononov, Jake ;

Williams, Jim

2020-10-01 | PDF

The intent of this project is to compare the effectiveness of network screening and diagnostic methods using aggregate SPFs and Test of Proportions with crash type SPFs. Both methods were applied to the same datasets containing crash history and exposure data. Sixteen (16) frequency and severity Colorado-specific crash type SPFs were developed for ...

01/20/2026

Title : Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs Creator(s) : Kononov, Jake;Williams, Jim;Thomas, Scott; Corporate Creator(s) : Apex Design, PC;DiExSys, LLC; Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-10-01 Report Number : CDOT-2020-12 URL : https://rosap.ntl.bts.gov/view/dot/88627 Kononov, Jake et al. (2020). Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs. Kononov, Jake and Williams, Jim and Thomas, Scott "Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs" (2020) Kononov, Jake et al. "Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs" , 2020 Export RIS Citation Information. TY - Tech Report AU - Kononov, Jake AU - Williams, Jim AU - Thomas, Scott A2 - Apex Design, PC A2 - DiExSys, LLC A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - The intent of this project is to compare the effectiveness of network screening and diagnostic methods using aggregate SPFs and Test of Proportions with crash type SPFs. Both methods were applied to the same datasets containing crash history and exposure data. Sixteen (16) frequency and severity Colorado-specific crash type SPFs were developed for the following facilities: Rural 2 lane highways, Urban 4-Lane Divided Freeways, Urban 4-Lane, Urban 3-Leg, Divided, Unsignalized Intersections and Urban 4-Lane, 4-Leg, Divided, Signalized Intersections. These new models were used to evaluate and compare the effectiveness of both methods for diagnostics and network screening. Implementation: CDOT will consider incorporating the following findings in its safety management practices: 1) In some cases when two or more major crash types are concurrently elevated the overall number of crashes may be elevated without upsetting the balance of proportions among crash types. Such events happen infrequently but can’t be detected by a test of proportions. 2) Test of proportion presently does not have a capability to detect elevated crash severity of a specific crash type. An effective strategy to remedy the situation is to develop stratified diagnostic norms for injury and fatal crashes only and to introduce injury focused level of diagnostic tests in addition to presently used tests for crashes of all severity. AN - dot:88627 ET - Final Report KW - Predictive models KW - Pattern recognition systems KW - Empirical methods KW - Bayes' theorem KW - Evaluation KW - Measures of effectiveness KW - Crash types KW - Fatalities LA - English PB - Colorado. Dept. of Transportation. Applied Research and Innovation Branch PY - 2020-10-01 SN - CDOT-2020-12 TI - Evaluating Effectiveness of Crash Type SPFs in Safety Management: Comparing the Effectiveness of Network Screening and Diagnostic Methods Using Aggregate SPFs and Test of Proportion With Crash Type SPFs M3 - Tech Report N1 - United States N1 - 319.02 UR - https://rosap.ntl.bts.gov/view/dot/88627 ER -
Implementation of an FCC Compliant Radar

Liu, Richard ;

Wang, Ying

2010-04-15 | PDF

This project implemented air-coupled and ground-coupled Ground Penetrating Radar (GPR) systems, developed by the Project 0-4820, to provide the Texas Department of Transportation (TxDOT) with the ability to collect network and project level survey data. The GPR software can extract and report top layer thickness information as well as dielectric co ...

01/20/2026

Title : Implementation of an FCC Compliant Radar Creator(s) : Liu, Richard;Wang, Ying;Ren, Wei; Corporate Creator(s) : University of Houston. Department of Civil and Environmental Engineering Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2010-04-15 Report Number : 5-4820-01-2 URL : https://rosap.ntl.bts.gov/view/dot/88626 Liu, Richard et al. (2010). Implementation of an FCC Compliant Radar. Liu, Richard and Wang, Ying and Ren, Wei "Implementation of an FCC Compliant Radar" (2010) Liu, Richard et al. "Implementation of an FCC Compliant Radar" , 2010 Export RIS Citation Information. TY - Tech Report AU - Liu, Richard AU - Wang, Ying AU - Ren, Wei A2 - University of Houston. Department of Civil and Environmental Engineering A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - This project implemented air-coupled and ground-coupled Ground Penetrating Radar (GPR) systems, developed by the Project 0-4820, to provide the Texas Department of Transportation (TxDOT) with the ability to collect network and project level survey data. The GPR software can extract and report top layer thickness information as well as dielectric constant automatically without an operator’s interpretation. This report analyzes the effectiveness, cost, and recommendations for state-wide implementation of such GPR systems. AN - dot:88626 KW - Compliance KW - Equipment KW - Ground penetrating radar KW - Pavements KW - Regulations KW - Thickness LA - English PB - Texas. Department of Transportation PY - 2010-04-15 SN - 5-4820-01-2 TI - Implementation of an FCC Compliant Radar M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88626 ER -
Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing

Liu, Richard ;

Li, Jing

2007-11-01 | PDF

In this project, the prototyped air-coupled and ground-coupled ground penetrating radar (GPR) devices, that were developed by the Project 0-4820, have been upgraded. Special antenna shielding structures have been developed to guide the electromagnetic energy down into ground to prevent the GPR devices from radiating into the air. After repeating th ...

01/20/2026

Title : Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing Creator(s) : Liu, Richard;Li, Jing;Wang, Ying;Ren, Wei; Corporate Creator(s) : University of Houston. Department of Civil and Environmental Engineering Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2007-11-01 Report Number : FHWA/TX-07/5-4820-01-1 URL : https://rosap.ntl.bts.gov/view/dot/88625 Liu, Richard et al. (2007). Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing. Liu, Richard et al. "Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing" (2007) Liu, Richard et al. "Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing" , 2007 Export RIS Citation Information. TY - Tech Report AU - Liu, Richard AU - Li, Jing AU - Wang, Ying AU - Ren, Wei A2 - University of Houston. Department of Civil and Environmental Engineering A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - In this project, the prototyped air-coupled and ground-coupled ground penetrating radar (GPR) devices, that were developed by the Project 0-4820, have been upgraded. Special antenna shielding structures have been developed to guide the electromagnetic energy down into ground to prevent the GPR devices from radiating into the air. After repeating the "testing-and-modifying" process on the GPR devices several times, both the air-coupled and ground-coupled GPR devices are now completely compliant with FCC requirements. The FCC testing reports by Nemko Inc. are included in the appendix part of this report. The testing reports and other documents for FCC certificate applications have been submitted to FCC and the GPR certificates are expected in a few weeks. AN - dot:88625 KW - Compliance KW - Equipment KW - Ground penetrating radar KW - Pavements KW - Regulations KW - Thickness LA - English PB - Texas. Department of Transportation PY - 2007-11-01 SN - FHWA/TX-07/5-4820-01-1 TI - Implementation of an FCC Compliant Radar Part 1: Radar Development and FCC Testing M3 - Tech Report N1 - United States N1 - 5-4820-01 UR - https://rosap.ntl.bts.gov/view/dot/88625 ER -
Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only)

Dix, Arnold ;

English, Gary

2020-12-01 | PDF

Senate Bill (SB) 19-032 required CDOT to conduct a study assessing the feasibility of allowing the transportation of hazardous materials through EJMT and to prepare a study report that includes the findings and recommendations as to whether and under what conditions the transportation of hazmat through the tunnel could be allowed.

01/20/2026

Title : Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only) Creator(s) : Dix, Arnold;English, Gary;Floyd, Mary Keith;Guevara, Bernie;Heger, Oliver;King, Stephanie;Kohl, Bernhard;Martinez, Alfonso;Salamon, Michael;Stacey, Conrad;Williams, Christy; Corporate Creator(s) : Stantec Consulting Services Inc. Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-12-01 Report Number : CDOT-2020-15 URL : https://rosap.ntl.bts.gov/view/dot/88624 Dix, Arnold et al. (2020). Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only). Dix, Arnold et al. "Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only)" (2020) Dix, Arnold et al. "Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only)" , 2020 Export RIS Citation Information. TY - Tech Report AU - Dix, Arnold AU - English, Gary AU - Floyd, Mary Keith AU - Guevara, Bernie AU - Heger, Oliver AU - King, Stephanie AU - Kohl, Bernhard AU - Martinez, Alfonso AU - Salamon, Michael AU - Stacey, Conrad AU - Williams, Christy A2 - Stantec Consulting Services Inc. A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - Senate Bill (SB) 19-032 required CDOT to conduct a study assessing the feasibility of allowing the transportation of hazardous materials through EJMT and to prepare a study report that includes the findings and recommendations as to whether and under what conditions the transportation of hazmat through the tunnel could be allowed. AN - dot:88624 ET - Final Report: (June - December 2020) KW - Tunnel supports KW - Hazardous materials KW - Recommendations KW - Risk assessment KW - Decision making KW - Infrastructure KW - Transportation safety KW - Implementation KW - EJMT KW - hazmat LA - English PB - Colorado. Dept. of Transportation. Applied Research and Innovation Branch PY - 2020-12-01 SN - CDOT-2020-15 TI - Transportation of Hazardous Materials Through Eisenhower-Edwin C Johnson Memorial Tunnel – Study (Executive Summary Only) M3 - Tech Report N1 - United States N1 - R320.06 UR - https://rosap.ntl.bts.gov/view/dot/88624 ER -
Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches

Hendrikx, Jordy ;

Jones, Alan

2020-09-30 | PDF

This report provides a synthesis on the use and design of snow sheds to protect transportation corridors against avalanches. This report summarizes the various snow shed designs and standards, regulation environment, construction and operational costs, risk, benefits, loading considerations, operational and design considerations, and alternate meth ...

01/20/2026

Title : Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches Creator(s) : Hendrikx, Jordy;Jones, Alan;Schauer, Andrew;Buhler, Ryan; Corporate Creator(s) : Montana State University (Bozeman, Mont). Department of Earth Sciences;Dynamic Avalanche Consulting, Revelstoke, BC, Canada; Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-09-30 Report Number : CDOT-2020-13 URL : https://rosap.ntl.bts.gov/view/dot/88623 Hendrikx, Jordy et al. (2020). Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches. Hendrikx, Jordy et al. "Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches" (2020) Hendrikx, Jordy et al. "Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches" , 2020 Export RIS Citation Information. TY - Tech Report AU - Hendrikx, Jordy AU - Jones, Alan AU - Schauer, Andrew AU - Buhler, Ryan A2 - Montana State University (Bozeman, Mont). Department of Earth Sciences A2 - Dynamic Avalanche Consulting, Revelstoke, BC, Canada A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - This report provides a synthesis on the use and design of snow sheds to protect transportation corridors against avalanches. This report summarizes the various snow shed designs and standards, regulation environment, construction and operational costs, risk, benefits, loading considerations, operational and design considerations, and alternate methods employed when snow sheds are no longer needed, or when alternative long-term mitigation measures are employed. This report documents designs that are currently in use on transportation corridors, have been proposed, and those that are being designed in North America. We have documented differences in construction approaches, additional mitigation considerations (e.g. deflection berms), and the resulting residual risk to the transportation corridor. We also show examples from international jurisdictions, including Switzerland and Norway, for consideration for potential future snow shed designs in North America. Transportation corridors throughout the world employ a variety of snow shed designs to protect against snow avalanches. The design, cost, and residual risk is a function of a number of factors, including the character of the avalanches, the location of the corridor relative to the avalanche path, the frequency of avalanche debris on the corridor, the volume of traffic, and the engineering design and associated regulations determining the construction and operations of these structures. To help clearly illustrate these issues we have used three case studies and present a synthesis table to conclude. AN - dot:88623 ET - Final Report KW - Snow KW - Avalanches KW - Transportation corridors KW - Risk KW - Traffic mitigation KW - Regulation KW - Standards LA - English PB - Colorado. Dept. of Transportation. Applied Research and Innovation Branch PY - 2020-09-30 SN - CDOT-2020-13 TI - Synthesis Report on the Use and Design of Snow Sheds to Protect Transportation Corridors Against Avalanches M3 - Tech Report N1 - United States N1 - 5337.08 UR - https://rosap.ntl.bts.gov/view/dot/88623 ER -
I-25 Gap Work Zone Performance Measures Report

Waldman, Ben ;

Mitchell, Matthew

2020-05-01 | PDF

Following the FHWA report, A Primer on Work Zone Safety and Mobility Performance Measurement, September 2011, regarding work zone safety and mobility measures, CDOT has prioritized the research of select methods to evaluate the performance of the I-25 Gap work zone and future CDOT construction projects. Work zone performance measures provide compar ...

01/20/2026

Title : I-25 Gap Work Zone Performance Measures Report Creator(s) : Waldman, Ben;Mitchell, Matthew;Stamp, Alvin;Karimi, Negar; Corporate Creator(s) : Apex Design, PC Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-05-01 Report Number : CDOT-2020-16 URL : https://rosap.ntl.bts.gov/view/dot/88622 Waldman, Ben et al. (2020). I-25 Gap Work Zone Performance Measures Report. Waldman, Ben et al. "I-25 Gap Work Zone Performance Measures Report" (2020) Waldman, Ben et al. "I-25 Gap Work Zone Performance Measures Report" , 2020 Export RIS Citation Information. TY - Tech Report AU - Waldman, Ben AU - Mitchell, Matthew AU - Stamp, Alvin AU - Karimi, Negar A2 - Apex Design, PC A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - Following the FHWA report, A Primer on Work Zone Safety and Mobility Performance Measurement, September 2011, regarding work zone safety and mobility measures, CDOT has prioritized the research of select methods to evaluate the performance of the I-25 Gap work zone and future CDOT construction projects. Work zone performance measures provide comparative metrics that quantify the level of impact a work zone has on travelers, residents, businesses and workers. CDOT has identified the need to research and apply performance measures to the I-25 Gap construction project; establishing a foundation to improve the decisions that are made during planning, design and construction for the remainder of the I-25 Gap project and for future CDOT highway construction projects. This report defines the prescribed performance measure categories based on traffic volume, crash data and travel time. The performance measures discussed in this report are based on the construction impacts, identified by comparing data from before construction began to continuously recorded data being collected as the project progresses. The result of this study is the establishment of key performance metrics that can be measured during construction to monitor the impacts for this and future projects. AN - dot:88622 ET - Final Report KW - Safety KW - Mobility KW - Construction KW - Planning and design KW - Work zone safety KW - Performance measurement KW - Construction projects KW - Data collection LA - English PB - Colorado. Dept. of Transportation. Applied Research and Innovation Branch PY - 2020-05-01 SN - CDOT-2020-16 TI - I-25 Gap Work Zone Performance Measures Report M3 - Tech Report N1 - United States N1 - 320.02 UR - https://rosap.ntl.bts.gov/view/dot/88622 ER -
I-25 South Gap Queue Warning System Evaluation

Waldman, Ben ;

Freitas, Jason

2020-05-01 | PDF

During a construction project, traffic traveling through the construction zone experiences frequent instances where construction vehicles, incidents, and recurring congestion interrupt traffic flow that result in long queues and delays as well as increased crash rates. In an effort to help mitigate these instances, CDOT has deployed numerous smart ...

01/20/2026

Title : I-25 South Gap Queue Warning System Evaluation Creator(s) : Waldman, Ben;Freitas, Jason;Stamp, Alvin;Karimi, Negar; Corporate Creator(s) : Apex Design, PC Corporate Contributor(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch;United States. Department of Transportation. Federal Highway Administration; Published Date : 2020-05-01 Report Number : CDOT-2020-17 URL : https://rosap.ntl.bts.gov/view/dot/88621 Waldman, Ben et al. (2020). I-25 South Gap Queue Warning System Evaluation. Waldman, Ben et al. "I-25 South Gap Queue Warning System Evaluation" (2020) Waldman, Ben et al. "I-25 South Gap Queue Warning System Evaluation" , 2020 Export RIS Citation Information. TY - Tech Report AU - Waldman, Ben AU - Freitas, Jason AU - Stamp, Alvin AU - Karimi, Negar A2 - Apex Design, PC A3 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - During a construction project, traffic traveling through the construction zone experiences frequent instances where construction vehicles, incidents, and recurring congestion interrupt traffic flow that result in long queues and delays as well as increased crash rates. In an effort to help mitigate these instances, CDOT has deployed numerous smart work zone systems throughout the I-25 Gap construction zone including Queue Warning Systems (QWS)This report discusses the deployment of a QWS in the I-25 Gap work zone. Lessons learned regarding the QWS set up are discussed and field speed data has been analyzed to verify the system was operating as intended and to quantify the effectiveness of it. The results are intended to give CDOT confidence QWS are effective in mitigating sudden stops due to unanticipated queueing. Two measures of effectiveness (MOEs) were observed and evaluated for a one month period with I-25 Gap QWS activated (December 2019) and a one month period with the system deactivated (September 2019). The two MOEs include: 1. The average speed of vehicles during queue warning activation consisting of spot measurements of average speeds at each sensor location during QWS activation time periods. 2. The comparison of abrupt speed drop frequencies within 1 minute periods during QWS activation periods. Taken together, the results of the Average Speed and Abrupt Speed Reduction measures of effectiveness demonstrate the positive impacts of the QWS on traffic flow. AN - dot:88621 ET - Final Report: (Aug 2019 – May 2020) KW - Work zone safety KW - Mobility KW - Construction KW - Warning systems KW - Evaluation KW - Lessons learned LA - English PB - Colorado. Dept. of Transportation. Applied Research and Innovation Branch PY - 2020-05-01 SN - CDOT-2020-17 TI - I-25 South Gap Queue Warning System Evaluation M3 - Tech Report N1 - United States N1 - 320.05 UR - https://rosap.ntl.bts.gov/view/dot/88621 ER -
FAA News: 2002-2003

United States. Department of Transportation. Federal Aviation Administration

2002-01-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: 2002-2003 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2002-01-01 Series : FAA News DOI : https://doi.org/10.21949/nj9s-q530 United States. Department of Transportation. Federal Aviation Administration (2002). FAA News: 2002-2003. https://doi.org/10.21949/nj9s-q530 United States. Department of Transportation. Federal Aviation Administration "FAA News: 2002-2003" (2002), https://doi.org/10.21949/nj9s-q530 United States. Department of Transportation. Federal Aviation Administration "FAA News: 2002-2003" , 2002, https://doi.org/10.21949/nj9s-q530 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88619 DO - https://doi.org/10.21949/nj9s-q530 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2002-01-01 T2 - FAA News TI - FAA News: 2002-2003 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88619 ER -
FAA News: September-October 2001

United States. Department of Transportation. Federal Aviation Administration

2001-09-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: September-October 2001 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2001-09-01 Series : FAA News DOI : https://doi.org/10.21949/25w6-0q06 United States. Department of Transportation. Federal Aviation Administration (2001). FAA News: September-October 2001. https://doi.org/10.21949/25w6-0q06 United States. Department of Transportation. Federal Aviation Administration "FAA News: September-October 2001" (2001), https://doi.org/10.21949/25w6-0q06 United States. Department of Transportation. Federal Aviation Administration "FAA News: September-October 2001" , 2001, https://doi.org/10.21949/25w6-0q06 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88618 DO - https://doi.org/10.21949/25w6-0q06 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2001-09-01 T2 - FAA News TI - FAA News: September-October 2001 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88618 ER -
FAA News: November-December 2001

United States. Department of Transportation. Federal Aviation Administration

2001-11-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: November-December 2001 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2001-11-01 Series : FAA News DOI : https://doi.org/10.21949/j51n-m862 United States. Department of Transportation. Federal Aviation Administration (2001). FAA News: November-December 2001. https://doi.org/10.21949/j51n-m862 United States. Department of Transportation. Federal Aviation Administration "FAA News: November-December 2001" (2001), https://doi.org/10.21949/j51n-m862 United States. Department of Transportation. Federal Aviation Administration "FAA News: November-December 2001" , 2001, https://doi.org/10.21949/j51n-m862 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88617 DO - https://doi.org/10.21949/j51n-m862 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2001-11-01 T2 - FAA News TI - FAA News: November-December 2001 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88617 ER -
FAA News: May-June 2001

United States. Department of Transportation. Federal Aviation Administration

2001-05-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: May-June 2001 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2001-05-01 Series : FAA News DOI : https://doi.org/10.21949/3d2q-rc35 United States. Department of Transportation. Federal Aviation Administration (2001). FAA News: May-June 2001. https://doi.org/10.21949/3d2q-rc35 United States. Department of Transportation. Federal Aviation Administration "FAA News: May-June 2001" (2001), https://doi.org/10.21949/3d2q-rc35 United States. Department of Transportation. Federal Aviation Administration "FAA News: May-June 2001" , 2001, https://doi.org/10.21949/3d2q-rc35 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88616 DO - https://doi.org/10.21949/3d2q-rc35 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2001-05-01 T2 - FAA News TI - FAA News: May-June 2001 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88616 ER -
FAA News: July-August 2001

United States. Department of Transportation. Federal Aviation Administration

2001-07-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: July-August 2001 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2001-07-01 Series : FAA News DOI : https://doi.org/10.21949/09gk-jy75 United States. Department of Transportation. Federal Aviation Administration (2001). FAA News: July-August 2001. https://doi.org/10.21949/09gk-jy75 United States. Department of Transportation. Federal Aviation Administration "FAA News: July-August 2001" (2001), https://doi.org/10.21949/09gk-jy75 United States. Department of Transportation. Federal Aviation Administration "FAA News: July-August 2001" , 2001, https://doi.org/10.21949/09gk-jy75 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88615 DO - https://doi.org/10.21949/09gk-jy75 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2001-07-01 T2 - FAA News TI - FAA News: July-August 2001 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88615 ER -
FAA News: January-April 2001

United States. Department of Transportation. Federal Aviation Administration

2001-01-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: January-April 2001 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2001-01-01 Series : FAA News DOI : https://doi.org/10.21949/vncz-4f26 United States. Department of Transportation. Federal Aviation Administration (2001). FAA News: January-April 2001. https://doi.org/10.21949/vncz-4f26 United States. Department of Transportation. Federal Aviation Administration "FAA News: January-April 2001" (2001), https://doi.org/10.21949/vncz-4f26 United States. Department of Transportation. Federal Aviation Administration "FAA News: January-April 2001" , 2001, https://doi.org/10.21949/vncz-4f26 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88614 DO - https://doi.org/10.21949/vncz-4f26 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2001-01-01 T2 - FAA News TI - FAA News: January-April 2001 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88614 ER -
FAA News: September-October 2000

United States. Department of Transportation. Federal Aviation Administration

2000-09-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: September-October 2000 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2000-09-01 Series : FAA News DOI : https://doi.org/10.21949/8bvw-7k21 United States. Department of Transportation. Federal Aviation Administration (2000). FAA News: September-October 2000. https://doi.org/10.21949/8bvw-7k21 United States. Department of Transportation. Federal Aviation Administration "FAA News: September-October 2000" (2000), https://doi.org/10.21949/8bvw-7k21 United States. Department of Transportation. Federal Aviation Administration "FAA News: September-October 2000" , 2000, https://doi.org/10.21949/8bvw-7k21 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88613 DO - https://doi.org/10.21949/8bvw-7k21 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2000-09-01 T2 - FAA News TI - FAA News: September-October 2000 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88613 ER -
FAA News: November-December 2000

United States. Department of Transportation. Federal Aviation Administration

2009-11-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: November-December 2000 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2009-11-01 Series : FAA News DOI : https://doi.org/10.21949/vgsx-vz50 United States. Department of Transportation. Federal Aviation Administration (2009). FAA News: November-December 2000. https://doi.org/10.21949/vgsx-vz50 United States. Department of Transportation. Federal Aviation Administration "FAA News: November-December 2000" (2009), https://doi.org/10.21949/vgsx-vz50 United States. Department of Transportation. Federal Aviation Administration "FAA News: November-December 2000" , 2009, https://doi.org/10.21949/vgsx-vz50 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88612 DO - https://doi.org/10.21949/vgsx-vz50 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2009-11-01 T2 - FAA News TI - FAA News: November-December 2000 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88612 ER -
FAA News: May-June 2000

United States. Department of Transportation. Federal Aviation Administration

2000-05-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: May-June 2000 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2000-05-01 Series : FAA News DOI : https://doi.org/10.21949/ekmx-c405 United States. Department of Transportation. Federal Aviation Administration (2000). FAA News: May-June 2000. https://doi.org/10.21949/ekmx-c405 United States. Department of Transportation. Federal Aviation Administration "FAA News: May-June 2000" (2000), https://doi.org/10.21949/ekmx-c405 United States. Department of Transportation. Federal Aviation Administration "FAA News: May-June 2000" , 2000, https://doi.org/10.21949/ekmx-c405 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88611 DO - https://doi.org/10.21949/ekmx-c405 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2000-05-01 T2 - FAA News TI - FAA News: May-June 2000 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88611 ER -
FAA News: July-August 2000

United States. Department of Transportation. Federal Aviation Administration

2000-07-01 | FAA News | PDF

Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes.

01/20/2026

Title : FAA News: July-August 2000 Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 2000-07-01 Series : FAA News DOI : https://doi.org/10.21949/tf1e-dp45 United States. Department of Transportation. Federal Aviation Administration (2000). FAA News: July-August 2000. https://doi.org/10.21949/tf1e-dp45 United States. Department of Transportation. Federal Aviation Administration "FAA News: July-August 2000" (2000), https://doi.org/10.21949/tf1e-dp45 United States. Department of Transportation. Federal Aviation Administration "FAA News: July-August 2000" , 2000, https://doi.org/10.21949/tf1e-dp45 Export RIS Citation Information. TY - Press Release A2 - United States. Department of Transportation. Federal Aviation Administration AB - Published by the FAA Public Affairs Department, "FAA News" informed employees of the Administration's current news, including projects, events, and policy changes. AN - dot:88610 DO - https://doi.org/10.21949/tf1e-dp45 KW - Aviation KW - History KW - Management KW - News KW - Organizations KW - Transportation policy LA - English PB - United States. Department of Transportation. Federal Aviation Administration PY - 2000-07-01 T2 - FAA News TI - FAA News: July-August 2000 M3 - Press Release N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/88610 ER -

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