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Showing 301 - 320 of 527 results

Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact

Walsh, Edward

;

Hardison, Mathew A.

2026-09-30 | PDF

The Railroad Information Sharing Environment (RISE) is a voluntary, non-regulatory, non-punitive, data-driven safety partnership consisting of railroad stakeholders, including the Federal Railroad Administration (FRA), to advance railroad safety. Through a data trust, railroad stakeholders voluntarily share data and work collaboratively to address ...

10/05/2026

Title : Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact Creator(s) : Walsh, Edward;Hardison, Mathew A.; Corporate Creator(s) : MITRE Corporation Corporate Contributor(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology Published Date : 2026-09-30 Report Number : DOT/FRA/ORD-26/26 URL : https://rosap.ntl.bts.gov/view/dot/93754
Walsh, E., & Hardison, M. A. (2026). Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact (Report No. DOT/FRA/ORD-26/26). United States. Department of Transportation. Federal Railroad Administration. https://rosap.ntl.bts.gov/view/dot/93754

Walsh, Edward and Mathew A. Hardison. Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact. Report no. DOT/FRA/ORD-26/26. United States. Department of Transportation. Federal Railroad Administration, 2026. https://rosap.ntl.bts.gov/view/dot/93754.

Walsh, Edward, and Mathew A. Hardison Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact. United States. Department of Transportation. Federal Railroad Administration, 2026, Report no. DOT/FRA/ORD-26/26, ROSA P. https://rosap.ntl.bts.gov/view/dot/93754.
Export RIS Citation Information. TY - Tech Report AU - Walsh, Edward AU - Hardison, Mathew A. A2 - MITRE Corporation A3 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology A4 - Wornoff, Jason; Blue, Shala AB - The Railroad Information Sharing Environment (RISE) is a voluntary, non-regulatory, non-punitive, data-driven safety partnership consisting of railroad stakeholders, including the Federal Railroad Administration (FRA), to advance railroad safety. Through a data trust, railroad stakeholders voluntarily share data and work collaboratively to address complex railroad safety challenges. Between October 2024 and March 2025, FRA contracted MITRE Corporation (MITRE) to review the RISE program to assess and document lessons learned and identify opportunities to expand the data trust and the impact of RISE. The research team reviewed RISE program documentation, interviewed RISE stakeholders, and assessed the functionality of RISE in relation to similar programs operating a data trust. AN - dot:93754 DA - 2026-09-30 ET - October 2024 - March 2025 KW - Railroad safety KW - Data KW - Public private partnerships KW - Railroads KW - Data sharing LA - English PB - United States. Department of Transportation. Federal Railroad Administration PY - 2026 SN - DOT/FRA/ORD-26/26 TI - Railroad Information Sharing Environment (RISE): Program Attributes, Lessons Learned, and Opportunities for Expanded Future Impact M3 - Tech Report N1 - United States N1 - 693JJ624C000049 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93754 ER -
Railroad Information Sharing Environment Data Steward: Phase II

Franz, Mark L.

;

Emtenan, Tahsin

2026-09-30 | PDF

Building on the success of Phase I, Phase II of the FRA sponsored Railroad Information Sharing Environment (RISE) established collaborative relationships among rail stakeholders in class I freight, passenger and short line railroads, in addition to labor groups, state DOTs and railroad safety special interests groups with support from the Volpe Tra ...

10/05/2026

Title : Railroad Information Sharing Environment Data Steward: Phase II Creator(s) : Franz, Mark L.;Emtenan, Tahsin;Aras, Rohan;Zahedian, Sara;Sekula, Przemyslaw;Maharjan, Ateet; Corporate Creator(s) : University of Maryland (College Park, Md.);University of Maryland (College Park, Md.). Center for Advanced Transportation Technology; Corporate Contributor(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology Published Date : 2026-09-30 Report Number : DOT/FRA/ORD-26/27 URL : https://rosap.ntl.bts.gov/view/dot/93753
Franz, M. L., Emtenan, T., Aras, R., Zahedian, S., Sekula, P., & Maharjan, A. (2026). Railroad Information Sharing Environment Data Steward: Phase II (Report No. DOT/FRA/ORD-26/27). United States. Department of Transportation. Federal Railroad Administration. https://rosap.ntl.bts.gov/view/dot/93753

Franz, Mark L., Tahsin Emtenan, Rohan Aras, Sara Zahedian, Przemyslaw Sekula, and Ateet Maharjan. Railroad Information Sharing Environment Data Steward: Phase II. Report no. DOT/FRA/ORD-26/27. United States. Department of Transportation. Federal Railroad Administration, 2026. https://rosap.ntl.bts.gov/view/dot/93753.

Franz, Mark L., et al. Railroad Information Sharing Environment Data Steward: Phase II. United States. Department of Transportation. Federal Railroad Administration, 2026, Report no. DOT/FRA/ORD-26/27, ROSA P. https://rosap.ntl.bts.gov/view/dot/93753.
Export RIS Citation Information. TY - Tech Report AU - Franz, Mark L. AU - Emtenan, Tahsin AU - Aras, Rohan AU - Zahedian, Sara AU - Sekula, Przemyslaw AU - Maharjan, Ateet A2 - University of Maryland (College Park, Md.) A2 - University of Maryland (College Park, Md.). Center for Advanced Transportation Technology A3 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology AB - Building on the success of Phase I, Phase II of the FRA sponsored Railroad Information Sharing Environment (RISE) established collaborative relationships among rail stakeholders in class I freight, passenger and short line railroads, in addition to labor groups, state DOTs and railroad safety special interests groups with support from the Volpe Transportation Systems Center and RISE third-party data steward, the University of Maryland - Center for Advanced Transportation Technology Laboratory (CATT Lab). This Phase, conducted between September 2021 and February 2025, developed Issue Analysis Teams (IAT) to pursue railroad safety topics identified by FRA, Volpe, and railroad stakeholders, with the goal of improving railroad safety. Two IATs were established around the topics of rail property trespassing and vertical profiles of highway-rail grade crossings. This report will discuss the development of these IATs and three RISE products, a Grade Crossing Planar Deviation Dashboard, Grade Crossing Vehicle Simulation Model, and a Non- Injury Railroad Property Trespassing Collection Form that were developed with the direction of RISE stakeholders. AN - dot:93753 DA - 2026-09-30 ET - Sept 2021- Feb 2025 KW - Data sharing KW - Railroad safety KW - Grade crossing protection systems KW - Simulation LA - English PB - United States. Department of Transportation. Federal Railroad Administration PY - 2026 SN - DOT/FRA/ORD-26/27 TI - Railroad Information Sharing Environment Data Steward: Phase II M3 - Tech Report N1 - United States N1 - 69A36521403060RRDMD DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93753 ER -
A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards

Sohrabi, Soheil

;

Tajik, Amir

2026-09-30 | PDF

Researchers from Michigan Technological University, in collaboration with Argonne National Laboratory, conducted this study from May 2022 to July 2025. They aimed to identify and mitigate risks of current and future tropical storms impacting the railroad infrastructure along the Gulf of America. The study focused on two critical track segments owne ...

10/05/2026

Title : A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards Creator(s) : Sohrabi, Soheil;Tajik, Amir;Darestani, Yousef;Pringle, William;Lautala, Pasi;Xue, Pengfei; Corporate Creator(s) : Michigan Technological University Corporate Contributor(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology Published Date : 2026-09-30 Report Number : DOT/FRA/ORD-26/29 URL : https://rosap.ntl.bts.gov/view/dot/93752
Sohrabi, S., Tajik, A., Darestani, Y., Pringle, W., Lautala, P., & Xue, P. (2026). A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards (Report No. DOT/FRA/ORD-26/29). United States. Department of Transportation. Federal Railroad Administration. https://rosap.ntl.bts.gov/view/dot/93752

Sohrabi, Soheil, Amir Tajik, Yousef Darestani, William Pringle, Pasi Lautala, and Pengfei Xue. A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards. Report no. DOT/FRA/ORD-26/29. United States. Department of Transportation. Federal Railroad Administration, 2026. https://rosap.ntl.bts.gov/view/dot/93752.

Sohrabi, Soheil, et al. A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards. United States. Department of Transportation. Federal Railroad Administration, 2026, Report no. DOT/FRA/ORD-26/29, ROSA P. https://rosap.ntl.bts.gov/view/dot/93752.
Export RIS Citation Information. TY - Tech Report AU - Sohrabi, Soheil AU - Tajik, Amir AU - Darestani, Yousef AU - Pringle, William AU - Lautala, Pasi AU - Xue, Pengfei A2 - Michigan Technological University A3 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology AB - Researchers from Michigan Technological University, in collaboration with Argonne National Laboratory, conducted this study from May 2022 to July 2025. They aimed to identify and mitigate risks of current and future tropical storms impacting the railroad infrastructure along the Gulf of America. The study focused on two critical track segments owned and operated by CSX Transportation and CN railway in the Northern Gulf of America (NGOA). AB - The research team developed a comprehensive, risk-based framework to estimate the impact of storm-induced surge and wave hazards on coastal railroads along the NGOA coastline. The research team integrated a physics-based high-fidelity hydrodynamic model to simulate the storm surge and wave generated by tropical storms. The simulations projected future storms and data adjustments for the year 2050. The research team integrated the probabilistic hazard model with a statistical model that assessed the failure probability of railroad components to determine the probability of failure of tracks and bridges due to ballast and embankment scour and the uplift of ballasted bridge decks. The failure probabilities were used within a statistical analysis to determine expected life of tracks and bridges and to devise mitigation strategies that can increase the expected life of coastal tracks and bridges. AN - dot:93752 DA - 2026-09-30 ET - 05/01/2022 - 08/01/2025 KW - Coasts KW - Railroad tracks KW - Bridge waterways KW - Embankments KW - Floods KW - Storms LA - English PB - United States. Department of Transportation. Federal Railroad Administration PY - 2026 SN - DOT/FRA/ORD-26/29 TI - A Risk-Informed Decision-Making Framework for Coastal Railroad System Subjected to Storm Hazards M3 - Tech Report N1 - United States N1 - 693JJ622C000006 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93752 ER -
FRA DOTX-216 Passenger Vehicle Characterization and Modeling

Klopp, Adam

;

Gauvain, Ben

2026-09-01 | PDF

Transportation Technology Center, Inc. (TTCI), now MxV Rail, performed work funded by the Federal Railroad Administration to characterize and model the high-speed passenger vehicle DOTX-216 car. The objectives of this project were to develop a list of parameters necessary to complete a dynamic model of the passenger vehicle, perform tests to measur ...

10/05/2026

Title : FRA DOTX-216 Passenger Vehicle Characterization and Modeling Creator(s) : Klopp, Adam;Gauvain, Ben;Walker, Russell; Corporate Creator(s) : Transportation Technology Center, Inc. (now MxV Rail) Corporate Contributor(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology Published Date : 2026-09-01 Report Number : DOT/FRA/ORD-26/30 URL : https://rosap.ntl.bts.gov/view/dot/93751
Klopp, A., Gauvain, B., & Walker, R. (2026). FRA DOTX-216 Passenger Vehicle Characterization and Modeling (Report No. DOT/FRA/ORD-26/30). United States. Department of Transportation. Federal Railroad Administration. https://rosap.ntl.bts.gov/view/dot/93751

Klopp, Adam, Ben Gauvain, and Russell Walker. FRA DOTX-216 Passenger Vehicle Characterization and Modeling. Report no. DOT/FRA/ORD-26/30. United States. Department of Transportation. Federal Railroad Administration, 2026. https://rosap.ntl.bts.gov/view/dot/93751.

Klopp, Adam, et al. FRA DOTX-216 Passenger Vehicle Characterization and Modeling. United States. Department of Transportation. Federal Railroad Administration, 2026, Report no. DOT/FRA/ORD-26/30, ROSA P. https://rosap.ntl.bts.gov/view/dot/93751.
Export RIS Citation Information. TY - Tech Report AU - Klopp, Adam AU - Gauvain, Ben AU - Walker, Russell A2 - Transportation Technology Center, Inc. (now MxV Rail) A3 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology A4 - Meddah, Abe AB - Transportation Technology Center, Inc. (TTCI), now MxV Rail, performed work funded by the Federal Railroad Administration to characterize and model the high-speed passenger vehicle DOTX-216 car. The objectives of this project were to develop a list of parameters necessary to complete a dynamic model of the passenger vehicle, perform tests to measure the parameters, develop a mathematical model using the measured parameters, and perform on-track tests to validate the model. TTCI performed these tasks and validated the model of the DOTX-216 car using a combination of validation methods. This report describes the procedures, results, and model validation analysis for the DOTX-216 car. AN - dot:93751 DA - 2026-09-01 KW - Railroad cars KW - Predictive control KW - Test procedures KW - Motor vehicle dynamics KW - Validation KW - Rail vehicle parameters KW - Dynamic model LA - English PB - United States. Department of Transportation. Federal Railroad Administration PY - 2026 SN - DOT/FRA/ORD-26/30 TI - FRA DOTX-216 Passenger Vehicle Characterization and Modeling M3 - Tech Report N1 - United States N1 - 326 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93751 ER -
Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results]

Baillargeon, Jay P. ;

Salazar, Juan Carlos Valdes

2026-09-01 | PDF

The team evaluated adding a complementary fixture to the VTU to allow assessment of TGMS accuracy under dynamic scenarios in a controlled laboratory environment. The fixture would dynamically move short railhead samples, providing the same rail deviation input to the optical sensors of the tested TGMS that the VTU is inputting to the rail vehicle. ...

10/05/2026

Title : Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results] Creator(s) : Baillargeon, Jay P.;Salazar, Juan Carlos Valdes;Bruzek, Radim;Bloom, Jeff; Corporate Creator(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology;ENSCO, Inc; Published Date : 2026-09-01 Report Number : RR 26-08 URL : https://rosap.ntl.bts.gov/view/dot/93750
Baillargeon, J. P., Salazar, J. C. V., Bruzek, R., & Bloom, J. (2026). Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results] (Report No. RR 26-08). United States. Department of Transportation. Federal Railroad Administration. https://rosap.ntl.bts.gov/view/dot/93750

Baillargeon, Jay P., Juan Carlos Valdes Salazar, Radim Bruzek, and Jeff Bloom. Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results]. Report no. RR 26-08. United States. Department of Transportation. Federal Railroad Administration, 2026. https://rosap.ntl.bts.gov/view/dot/93750.

Baillargeon, Jay P., et al. Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results]. United States. Department of Transportation. Federal Railroad Administration, 2026, Report no. RR 26-08, ROSA P. https://rosap.ntl.bts.gov/view/dot/93750.
Export RIS Citation Information. TY - Brief AU - Baillargeon, Jay P. AU - Salazar, Juan Carlos Valdes AU - Bruzek, Radim AU - Bloom, Jeff A2 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology A2 - ENSCO, Inc AB - The team evaluated adding a complementary fixture to the VTU to allow assessment of TGMS accuracy under dynamic scenarios in a controlled laboratory environment. The fixture would dynamically move short railhead samples, providing the same rail deviation input to the optical sensors of the tested TGMS that the VTU is inputting to the rail vehicle. Researchers explored two potential concepts for the fixture, one based on a Stewart platform and the other using a set of linear motor actuators. The team found that the VTU fitted with the additional fixture can be used to validate TGMS systems in tangents with reasonable fidelity, despite the inability to input gage deviations. This concept also would not be able to evaluate the performance of TGMS systems in curves due to VTU's inability to replicate centripetal accelerations and forces. AN - dot:93750 DA - 2026-09-01 ET - Research Results KW - Railroad tracks KW - Measurement KW - Vibration tests KW - Validation KW - Feasibility analysis LA - English PB - United States. Department of Transportation. Federal Railroad Administration PY - 2026 SN - RR 26-08 TI - Feasibility of Vibration Test Unit Modifications for TGMS Validations [Research Results] M3 - Brief N1 - United States N1 - 693JJ624F00039N DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93750 ER -
Machine Learning-based Analysis for Railway Track Maintenance

Goodarzi, Saeed

;

Ho, Carlton L.

2026-09-30 | PDF

Understanding and mitigating track degradation rates (TDRs) is crucial for ensuring the safety and efficiency of railway systems, as well as for controlling maintenance costs and preserving ride quality. The Federal Railroad Administration (FRA) sponsored the University of Massachusetts Amherst and Loram Technologies, Inc. to extensively analyze TD ...

10/05/2026

Title : Machine Learning-based Analysis for Railway Track Maintenance Creator(s) : Goodarzi, Saeed;Ho, Carlton L.;Kashani, Kevin;Hyslip, James P.; Corporate Creator(s) : University of Massachusetts at Amherst;Loram Technologies, Inc; Corporate Contributor(s) : United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology Published Date : 2026-09-30 Report Number : DOT/FRA/ORD-26/28 URL : https://rosap.ntl.bts.gov/view/dot/93749
Goodarzi, S., Ho, C. L., Kashani, K., & Hyslip, J. P. (2026). Machine Learning-based Analysis for Railway Track Maintenance (Report No. DOT/FRA/ORD-26/28). United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development, and Technology. https://rosap.ntl.bts.gov/view/dot/93749

Goodarzi, Saeed, Carlton L. Ho, Kevin Kashani, and James P. Hyslip. Machine Learning-based Analysis for Railway Track Maintenance. Report no. DOT/FRA/ORD-26/28. United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development, and Technology, 2026. https://rosap.ntl.bts.gov/view/dot/93749.

Goodarzi, Saeed, et al. Machine Learning-based Analysis for Railway Track Maintenance. United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development, and Technology, 2026, Report no. DOT/FRA/ORD-26/28, ROSA P. https://rosap.ntl.bts.gov/view/dot/93749.
Export RIS Citation Information. TY - Tech Report AU - Goodarzi, Saeed AU - Ho, Carlton L. AU - Kashani, Kevin AU - Hyslip, James P. A2 - University of Massachusetts at Amherst A2 - Loram Technologies, Inc A3 - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development and Technology A4 - Thompson, Hugh AB - Understanding and mitigating track degradation rates (TDRs) is crucial for ensuring the safety and efficiency of railway systems, as well as for controlling maintenance costs and preserving ride quality. The Federal Railroad Administration (FRA) sponsored the University of Massachusetts Amherst and Loram Technologies, Inc. to extensively analyze TDR over 280 miles of passenger revenue track using data from 2011 to 2021. Using a large dataset was pivotal, as it enhanced the robustness of the analysis, allowing for more accurate and reliable conclusions. The researchers used ground penetrating radar (GPR) and light detection and ranging (LiDAR) along with geometry data to examine subsurface and drainage conditions of the tracks. The project employed two distinct methods to estimate TDR, each offering unique insights and applicability based on available historical data and desired precision. These complementary approaches provide the industry with versatile tools for estimating TDR and improving maintenance scheduling, emphasizing their reliability and adaptability. AN - dot:93749 DA - 2026-09-30 ET - July 2022 - July 2024 KW - Railroads KW - Machine learning KW - Data KW - Drainage KW - Laser radar KW - Ground penetrating radar LA - English PB - United States. Department of Transportation. Federal Railroad Administration. Office of Research, Development, and Technology PY - 2026 SN - DOT/FRA/ORD-26/28 TI - Machine Learning-based Analysis for Railway Track Maintenance M3 - Tech Report N1 - United States N1 - FR22RPD31000000010 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93749 ER -
Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System

Wang, Yinhai

;

Shi, Yan

2025-12-01 | PDF

This project developed and evaluated a cost-effective, camera-based system for FHWA 13-bin vehicle classification using roadside video, edge computing, and deep learning. Traditional vehicle classification methods, such as inductive loops, pneumatic tubes, and manual counts, are often expensive to deploy and maintain and provide limited classificat ...

10/05/2026

Title : Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System Creator(s) : Wang, Yinhai;Shi, Yan;Liu, Chenxi;Chen, Kehua; Corporate Creator(s) : University of Washington. Washington State Transportation Center (TRAC);University of Washington. Department of Civil and Environmental Engineering; Corporate Contributor(s) : Washington State Department of Transportation Contributor(s) : Jahangirnejad, Shervin Published Date : 2025-12-01 Report Number : WA-RD 961.1 URL : https://rosap.ntl.bts.gov/view/dot/93748
Wang, Y., Shi, Y., Liu, C., & Chen, K. (2025). Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System (Report No. WA-RD 961.1). Washington State Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93748

Wang, Yinhai, Yan Shi, Chenxi Liu, and Kehua Chen. Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System. Report no. WA-RD 961.1. Washington State Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/93748.

Wang, Yinhai, et al. Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System. Washington State Department of Transportation, 2025, Report no. WA-RD 961.1, ROSA P. https://rosap.ntl.bts.gov/view/dot/93748.
Export RIS Citation Information. TY - Tech Report AU - Wang, Yinhai AU - Shi, Yan AU - Liu, Chenxi AU - Chen, Kehua A2 - University of Washington. Washington State Transportation Center (TRAC) A2 - University of Washington. Department of Civil and Environmental Engineering A3 - Washington State Department of Transportation AB - This project developed and evaluated a cost-effective, camera-based system for FHWA 13-bin vehicle classification using roadside video, edge computing, and deep learning. Traditional vehicle classification methods, such as inductive loops, pneumatic tubes, and manual counts, are often expensive to deploy and maintain and provide limited classification detail, particularly under challenging traffic, weather, and lighting conditions. To address these limitations, a portable roadside sensing platform was designed that integrates video cameras with edge computing hardware for on-site, near-real-time vehicle detection and classification. The system operates effectively in daytime, nighttime, and rainy conditions while minimizing data transfer requirements. At the core of the platform is an enhanced YOLOv11 deep learning model incorporating a mixture-of-experts (MoE) architecture. The model uses a shared backbone with multiple expert heads tailored to different environmental conditions, supported by a weather encoder and feature-wise linear modulation(FiLM) to adapt to variations in illumination, glare, and wet pavement. Model training and evaluation were conducted using a curated dataset of more than 20,000 vehicle instances annotated into the 13 FHWA vehicle classes and collected at WSDOT-relevant sites under diverse conditions. The training pipeline addressed class imbalance and visibility challenges through data augmentation, nighttime image enhancement, and class-weighted loss functions. The proposed system achieved an overall classification accuracy of up to 97.9 percent, with strong performance for heavy-duty vehicles and rare FHWA classes, even under adverse weather and lighting conditions. AN - dot:93748 DA - 2025-12-01 KW - Vehicle classification KW - Vehicle detectors KW - Deep learning KW - Expert systems KW - Data collection KW - Remote sensing KW - Cost effectiveness KW - Video cameras KW - multi-expert learning LA - English PB - Washington State Department of Transportation PY - 2025 SN - WA-RD 961.1 TI - Cost-Effective Traffic and Roadway Data Collection Using an Edge-Based Comprehensive Sensing System M3 - Tech Report N1 - United States N1 - T1461-AI DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93748 ER -
Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data

Caspi, Anat ;

Mehta, Kunal

2026-02-01 | PDF

This report synthesizes insights from eighteen WSDOT staff interviews to identify the roles, workflows, and steps needed to maintain a complete, reliable statewide sidewalk dataset that supports daily project delivery. Interviews pointed to recurring breakdowns in governance, approval, and update processes, especially closeout updates, provenance d ...

10/05/2026

Title : Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data Creator(s) : Caspi, Anat;Mehta, Kunal;Sepulveda, Tanisha; Corporate Creator(s) : University of Washington. Washington State Transportation Center (TRAC);University of Washington. Taskar Center for Accessible Technology; Corporate Contributor(s) : Washington State Department of Transportation Contributor(s) : Craig, Thomas Published Date : 2026-02-01 Report Number : WA-RD 957.1 URL : https://rosap.ntl.bts.gov/view/dot/93747
Caspi, A., Mehta, K., & Sepulveda, T. (2026). Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data (Report No. WA-RD 957.1). Washington State Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93747

Caspi, Anat, Kunal Mehta, and Tanisha Sepulveda. Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data. Report no. WA-RD 957.1. Washington State Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/93747.

Caspi, Anat, et al. Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data. Washington State Department of Transportation, 2026, Report no. WA-RD 957.1, ROSA P. https://rosap.ntl.bts.gov/view/dot/93747.
Export RIS Citation Information. TY - Tech Report AU - Caspi, Anat AU - Mehta, Kunal AU - Sepulveda, Tanisha A2 - University of Washington. Washington State Transportation Center (TRAC) A2 - University of Washington. Taskar Center for Accessible Technology A3 - Washington State Department of Transportation AB - This report synthesizes insights from eighteen WSDOT staff interviews to identify the roles, workflows, and steps needed to maintain a complete, reliable statewide sidewalk dataset that supports daily project delivery. Interviews pointed to recurring breakdowns in governance, approval, and update processes, especially closeout updates, provenance documentation, and unclear data ownership, alongside practical constraints in collection, validation, and integration. The outcome of the project is a recommendation for a pilot implementation providing the path forward for high-quality, up-to-date sidewalk data usable by all WSDOT staff and the public. WSDOT would benefit from this new data primarily through three new opportunities available: 1) improve project planning and engineering, 2) prioritize active transportation projects, and 3) support ADA coordination and transition planning. AN - dot:93747 DA - 2026-02-01 KW - Sidewalks KW - Data collection KW - Transportation planning KW - Implementation KW - Compliance KW - Plan implementation LA - English PB - Washington State Department of Transportation PY - 2026 SN - WA-RD 957.1 TI - Identification of the Optimal Approach to Maintain Complete Statewide Sidewalk Data M3 - Tech Report N1 - United States N1 - T1461, Task AT DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93747 ER -
Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction

Al-Qadi, Imad L.

;

Golparvar-Fard, Mani

2026-09-01 | PDF

This study developed a contactless and automated technique to estimate hot-mix asphalt pavement surface friction by combining computer vision image-based 3D reconstruction with machine learning. Existing continuous friction estimation equipment, including high-speed laser scanners, are costly to purchase and operate-limiting routine, frequent monit ...

10/05/2026

Title : Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction Creator(s) : Al-Qadi, Imad L.;Golparvar-Fard, Mani;Fakhreddine, Mohammad;Lang, Hong;Villamil, William D.; Corporate Creator(s) : Illinois Center for Transportation;University of Illinois at Urbana-Champaign; Corporate Contributor(s) : Illinois. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-09-01 Report Number : FHWA-ICT-26-017;UILU-2026-2019; DOI : https://doi.org/10.36501/0197-9191/26-019
Al-Qadi, I. L., Golparvar-Fard, M., Fakhreddine, M., Lang, H., & Villamil, W. D. (2026). Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction (Report No. FHWA-ICT-26-017). Illinois Center for Transportation. https://doi.org/10.36501/0197-9191/26-019

Al-Qadi, Imad L., Mani Golparvar-Fard, Mohammad Fakhreddine, Hong Lang, and William D. Villamil. Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction. Report no. FHWA-ICT-26-017. Illinois Center for Transportation, 2026. https://doi.org/10.36501/0197-9191/26-019.

Al-Qadi, Imad L., et al. Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction. Illinois Center for Transportation, 2026, Report no. FHWA-ICT-26-017, ROSA P. https://doi.org/10.36501/0197-9191/26-019.
Export RIS Citation Information. TY - Tech Report AU - Al-Qadi, Imad L. AU - Golparvar-Fard, Mani AU - Fakhreddine, Mohammad AU - Lang, Hong AU - Villamil, William D. A2 - Illinois Center for Transportation A2 - University of Illinois at Urbana-Champaign A3 - Illinois. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This study developed a contactless and automated technique to estimate hot-mix asphalt pavement surface friction by combining computer vision image-based 3D reconstruction with machine learning. Existing continuous friction estimation equipment, including high-speed laser scanners, are costly to purchase and operate-limiting routine, frequent monitoring. This study addressed this limitation through the development and utilization of cost-effective and scalable equipment. A Structure-from-Motion computer vision framework was developed to reconstruct pavement macrotexture in three dimensions and compute mean profile depth (MPD). Ground-control-based measurements agreed with a reference laser scanner within 15% across all test locations. A high-speed prototype using industrial cameras and a real-time kinematic positioning system was built. It was able to collect data up to 35 mi/hr and perform 3D reconstruction on cloud environments, increasing processing speed. The prototype was validated against a laser scanner at a controlled test track. The results demonstrated that contactless texture measurement and friction prediction are feasible and provide a foundation for more frequent, lower-cost monitoring of pavement surface characteristics, supporting proactive pavement management, safety screening, and more cost-effective maintenance decisions. The developed device measures texture and estimates friction for $61/mile, about 65% less than the $140/mile needed to collect both with current methods, and it costs only $73,500 to buy, compared with about $1,100,000 for a combined laser scanner and a transverse profiler. In addition, a data-driven model was developed to predict sideways friction measured by a Sideway-force Coefficient Routine Investigation Machine using pavement texture, traffic, roadway geometry, operating speed, and surface temperature. Three datasets collected in Florida and Illinois were used to evaluate the influence of dataset size, available features, and data distribution. Among the tree-based ensemble models evaluated, the Extra Trees model performed best, explaining approximately 85% of the variance, with MPD, traffic, operating speed, and surface temperature identified as the most influential variables. Finally, a finite element framework coupling a 3D tire model, texture-based friction model, and water film was developed to evaluate hydroplaning. The framework demonstrated that coarser macrotextures resulted in relatively better tire-pavement contact at higher speeds because of their improved surface drainage capacity. AN - dot:93746 DA - 2026-09-01 DO - https://doi.org/10.36501/0197-9191/26-019 ET - Final Report 7/1/22-9/30/26 KW - Pavement maintenance KW - Friction KW - Asphalt pavements KW - Photogrammetry KW - Machine learning KW - Hydroplaning KW - Transportation safety KW - Estimates KW - Microtexture KW - Hot mix asphalt KW - Datasets KW - Computer vision KW - Pavement Friction KW - Pavement Macrotexture LA - English PB - Illinois Center for Transportation PY - 2026 SN - FHWA-ICT-26-017 TI - Computer Vision-Based Contactless Estimation of Asphalt Pavement Surface Friction M3 - Tech Report N1 - United States N1 - R27-247 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93746 ER -
Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations

Cheever, John ;

Donnelly, Denis, E.

1994-10-01 | PDF

It has been estimated that over 60 asphalt mix designs are being specified by the various local governments and design consultants in the Denver metropolitan area. As material batches are ordered for delivery to these various agencies, the producers are required to constantly change their mixing formulations and plant operations. This constantly ch ...

10/05/2026

Title : Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations Creator(s) : Cheever, John;Donnelly, Denis, E.;Ferguson, Thom;LaForce, Bob;Potter, Dave;Sands, Scott;Zamora, Rich; Corporate Creator(s) : Denver Metropolitan Government Pavement Engineers Council;Metro Mix Design Task Force; Corporate Contributor(s) : Colorado. Department of Transportation Published Date : 1994-10-01 Report Number : CDOT-DTD-R-94-10 URL : https://rosap.ntl.bts.gov/view/dot/93745
Cheever, J., Donnelly, D. E., Ferguson, T., LaForce, B., Potter, D., Sands, S., & Zamora, R. (1994). Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations (Report No. CDOT-DTD-R-94-10). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93745

Cheever, John, Denis, E. Donnelly, Thom Ferguson, Bob LaForce, Dave Potter, Scott Sands, and Rich Zamora. Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations. Report no. CDOT-DTD-R-94-10. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93745.

Cheever, John, et al. Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations. Colorado. Department of Transportation, 1994, Report no. CDOT-DTD-R-94-10, ROSA P. https://rosap.ntl.bts.gov/view/dot/93745.
Export RIS Citation Information. TY - Tech Report AU - Cheever, John AU - Donnelly, Denis, E. AU - Ferguson, Thom AU - LaForce, Bob AU - Potter, Dave AU - Sands, Scott AU - Zamora, Rich A2 - Denver Metropolitan Government Pavement Engineers Council A2 - Metro Mix Design Task Force A3 - Colorado. Department of Transportation AB - It has been estimated that over 60 asphalt mix designs are being specified by the various local governments and design consultants in the Denver metropolitan area. As material batches are ordered for delivery to these various agencies, the producers are required to constantly change their mixing formulations and plant operations. This constantly changing process results in inefficiencies in production time and cost to the buyer, as well as variability in the process. The problem is intensified when towns and communities order small amounts of material for a local street project. In March, 1994 a Government Forum was held in conjunction with the annual meeting of the Colorado Asphalt Pavement Association. At this forum, a decision was made to organize a Task Force to address this problem and provide recommendations for asphalt paving materials in the Denver Metropolitan area. This report presents the recommendations of that Task Force. The recommendations include gradation, asphalt cement type, additives, RAP, voids, and laboratory design properties. Four standard mixes were identified. AN - dot:93745 DA - 1994-10-01 KW - Additives KW - Aggregate gradation KW - Air voids KW - Asphalt cement KW - Asphalt mixtures KW - Mix design KW - Properties of materials KW - Recommendations KW - Recycled materials LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-DTD-R-94-10 TI - Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93745 ER -
Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters

Goble, G. G. ;

Aboumatar, Hasan

1994-11-01 | PDF

The historical background of the Standard Penetration Test (SPT) is reviewed with particular emphasis of those efforts to make dynamic measurements during the driving operation. The mechanics of one dimensional wave propagation is reviewed with emphasis on those aspects of the theory that applies to SPT operations. During the course of the project ...

10/05/2026

Title : Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters Creator(s) : Goble, G. G.;Aboumatar, Hasan; Corporate Creator(s) : University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration;Colorado. Department of Transportation; Published Date : 1994-11-01 Report Number : CDOH-DTD-R-94 URL : https://rosap.ntl.bts.gov/view/dot/93744
Goble, G. G., & Aboumatar, H. (1994). Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters (Report No. CDOH-DTD-R-94). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93744

Goble, G. G. and Hasan Aboumatar. Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters. Report no. CDOH-DTD-R-94. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93744.

Goble, G. G., and Hasan Aboumatar Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters. Colorado. Department of Transportation, 1994, Report no. CDOH-DTD-R-94, ROSA P. https://rosap.ntl.bts.gov/view/dot/93744.
Export RIS Citation Information. TY - Tech Report AU - Goble, G. G. AU - Aboumatar, Hasan A2 - University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering A3 - United States. Department of Transportation. Federal Highway Administration A3 - Colorado. Department of Transportation AB - The historical background of the Standard Penetration Test (SPT) is reviewed with particular emphasis of those efforts to make dynamic measurements during the driving operation. The mechanics of one dimensional wave propagation is reviewed with emphasis on those aspects of the theory that applies to SPT operations. During the course of the project it was discovered that the accuracy of measurements produced by available accelerometers was questionable. A major effort was devoted to testing accelerometers in the laboratory and evaluating the results. A wave of mechanics analysis of both the Safety Hammer and the CME Automatic Hammer is presented and shown to agree closely with measurements. The conclusion was reached that the measurement system is now accurate and reasonably reliable. Measurements were made at field sites to evaluate the ability to calculate Wave Equations soil constants. Force and motion was calculated at the sampler from the top measurements. Results are presented for two different conditions. These results must be considered as preliminary, but they offer justification for optimism in the future use of the method. AN - dot:93744 DA - 1994-11-01 ET - Final Report KW - Dynamic tests KW - Force KW - Standards KW - Foundations KW - Soil penetration test KW - Laboratory tests KW - response KW - acceleration KW - SPT LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOH-DTD-R-94 TI - Dynamic Measurements on Penetrometers for Determination of Foundation Design Parameters M3 - Tech Report N1 - United States N1 - HPR 1488A DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93744 ER -
Test and Evaluation Plan for Determining Screener Training Effectiveness

Klock, Brenda A. ;

Fobes, J. L.

1999-04-01 | PDF

The efficacy of Computer-Based Training (CBT) programs, potentially useful for security checkpoint screener training, will be evaluated at three different airports. Candidates will be trained with one of three CBT programs or the Air Transport Association-approved classroom training program. The Screener Readiness Test, designed to assess screening ...

10/05/2026

Title : Test and Evaluation Plan for Determining Screener Training Effectiveness Creator(s) : Klock, Brenda A.;Fobes, J. L.; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Office of Aviation Security Research and Development Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 Contributor(s) : Rubinstein, Joshua;Maguire, William; Published Date : 1999-04-01 Report Number : DOT/FAA/AR-99142 URL : https://rosap.ntl.bts.gov/view/dot/93743
Klock, B. A., & Fobes, J. L. (1999). Test and Evaluation Plan for Determining Screener Training Effectiveness (Report No. DOT/FAA/AR-99142). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93743

Klock, Brenda A. and J. L. Fobes. Test and Evaluation Plan for Determining Screener Training Effectiveness. Report no. DOT/FAA/AR-99142. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93743.

Klock, Brenda A., and J. L. Fobes Test and Evaluation Plan for Determining Screener Training Effectiveness. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99142, ROSA P. https://rosap.ntl.bts.gov/view/dot/93743.
Export RIS Citation Information. TY - Tech Report AU - Klock, Brenda A. AU - Fobes, J. L. A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Office of Aviation Security Research and Development A3 - United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 AB - The efficacy of Computer-Based Training (CBT) programs, potentially useful for security checkpoint screener training, will be evaluated at three different airports. Candidates will be trained with one of three CBT programs or the Air Transport Association-approved classroom training program. The Screener Readiness Test, designed to assess screening-related knowledge, will then be used to evaluate the effectiveness of these programs. AN - dot:93743 DA - 1999-04-01 KW - Aircraft KW - Airports KW - Security KW - Baggage screening KW - Detectors KW - Information display systems KW - Explosives detectors KW - Human factors engineering KW - Test procedures KW - Tests KW - Warning systems KW - X rays KW - Reliability KW - Training KW - Computer aided instruction KW - Evaluation KW - Performance evaluations KW - Personnel development KW - Training programs KW - Aviation security KW - Checkpoint screeners KW - On job training KW - Program evaluation KW - Screener Readiness Test KW - Security personn LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99142 TI - Test and Evaluation Plan for Determining Screener Training Effectiveness M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93743 ER -
Aviation Screener On-the-Job Training Assessment - Content Outlines

Monichetti, Susan B. ;

Fobes, J. L.

1999-04-01 | PDF

Airport observations of screener on-the-job training indicated the need for a standardized set of performance evaluation objectives for each checkpoint task (X-ray, magnetometer, wanding/physical search, bag check, and exit lane). These objectives were based on the critical skills and abilities identified in the first phase of this effort. These ou ...

10/05/2026

Title : Aviation Screener On-the-Job Training Assessment - Content Outlines Creator(s) : Monichetti, Susan B.;Fobes, J. L.;Neiderman, Eric C.; 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. Associate Administrator for Civil Aviation Security, ACS-1 Published Date : 1999-04-01 Report Number : DOT/FAA/AR-99/36 URL : https://rosap.ntl.bts.gov/view/dot/93742
Monichetti, S. B., Fobes, J. L., & Neiderman, E. C. (1999). Aviation Screener On-the-Job Training Assessment - Content Outlines (Report No. DOT/FAA/AR-99/36). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93742

Monichetti, Susan B., J. L. Fobes, and Eric C. Neiderman. Aviation Screener On-the-Job Training Assessment - Content Outlines. Report no. DOT/FAA/AR-99/36. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93742.

Monichetti, Susan B., et al. Aviation Screener On-the-Job Training Assessment - Content Outlines. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99/36, ROSA P. https://rosap.ntl.bts.gov/view/dot/93742.
Export RIS Citation Information. TY - Tech Report AU - Monichetti, Susan B. AU - Fobes, J. L. AU - Neiderman, Eric C. A2 - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration. Associate Administrator for Civil Aviation Security, ACS-1 AB - Airport observations of screener on-the-job training indicated the need for a standardized set of performance evaluation objectives for each checkpoint task (X-ray, magnetometer, wanding/physical search, bag check, and exit lane). These objectives were based on the critical skills and abilities identified in the first phase of this effort. These outlines will form the basis for developing the formal on-the-job training (OJT) Mastery Test and provide a framework from which a comprehensive and standardized training program can be based. AN - dot:93742 DA - 1999-04-01 KW - Abilities KW - Aviation safety KW - Baggage screening KW - Security KW - Security checkpoints LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99/36 TI - Aviation Screener On-the-Job Training Assessment - Content Outlines M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93742 ER -
Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet

Schmidt, C. G. ;

Kobayashi, T.

1999-05-01 | PDF

New methods were developed and applied to extract and interpret information from the fracture surfaces of corrosion-fatigue specimens of clad and bare 2024-T3 aluminum sheet. We developed two fracture surface topography analysis methods that characterize the effects of environment and a fracture surface analysis and finite element modeling approach ...

10/05/2026

Title : Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet Creator(s) : Schmidt, C. G.;Kobayashi, T.;Shockey, D. A.; Corporate Creator(s) : SRI International Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research Published Date : 1999-05-01 Report Number : DOT/FAA/AR-99/34 URL : https://rosap.ntl.bts.gov/view/dot/93741
Schmidt, C. G., Kobayashi, T., & Shockey, D. A. (1999). Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet (Report No. DOT/FAA/AR-99/34). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93741

Schmidt, C. G., T. Kobayashi, and D. A. Shockey. Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet. Report no. DOT/FAA/AR-99/34. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999. https://rosap.ntl.bts.gov/view/dot/93741.

Schmidt, C. G., et al. Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1999, Report no. DOT/FAA/AR-99/34, ROSA P. https://rosap.ntl.bts.gov/view/dot/93741.
Export RIS Citation Information. TY - Tech Report AU - Schmidt, C. G. AU - Kobayashi, T. AU - Shockey, D. A. A2 - SRI International A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research AB - New methods were developed and applied to extract and interpret information from the fracture surfaces of corrosion-fatigue specimens of clad and bare 2024-T3 aluminum sheet. We developed two fracture surface topography analysis methods that characterize the effects of environment and a fracture surface analysis and finite element modeling approach to detect and quantify overloads that occurred during fatigue crack propagation. We used these methods to perform a detailed analysis of the fracture surface topography produced in the early stages of corrosion fatigue, and developed an understanding of the effect of environment on the crack nucleation mechanism based on fracture surface features. AN - dot:93741 DA - 1999-05-01 ET - Phase II Report KW - Aircraft structural components KW - Airplanes KW - Corrosion KW - Fatigue cracking LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1999 SN - DOT/FAA/AR-99/34 TI - Characterization of Early Stages of Corrosion Fatigue in Aircraft Skin - Phase II: Interpretation of Corrosion-Fatigue Fracture Surfaces in Alclad 2024-T3 Aluminum Alloy Sheet M3 - Tech Report N1 - United States N1 - 95-G-065 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93741 ER -
Preliminary Procedure to Predict Scour in Bedrock

Smith, Steven P.

1994-12-01 | PDF

The primary goal of this study is to develop a procedure to predict scour depths in bedrock that accounts for both the hydraulic conditions at the bridge site and the bedrock's ability to resist erosion. A methodology for determining material erodibility resulting from the erosive power of water has been presented by Annandale (1993, 1995). He intr ...

10/05/2026

Title : Preliminary Procedure to Predict Scour in Bedrock Creator(s) : Smith, Steven P. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1994-12-01 Report Number : CDOT-R-SD-94-14 URL : https://rosap.ntl.bts.gov/view/dot/93740
Smith, S. P. (1994). Preliminary Procedure to Predict Scour in Bedrock (Report No. CDOT-R-SD-94-14). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93740

Smith, Steven P.. Preliminary Procedure to Predict Scour in Bedrock. Report no. CDOT-R-SD-94-14. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93740.

Smith, Steven P. Preliminary Procedure to Predict Scour in Bedrock. Colorado. Department of Transportation, 1994, Report no. CDOT-R-SD-94-14, ROSA P. https://rosap.ntl.bts.gov/view/dot/93740.
Export RIS Citation Information. TY - Tech Report AU - Smith, Steven P. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The primary goal of this study is to develop a procedure to predict scour depths in bedrock that accounts for both the hydraulic conditions at the bridge site and the bedrock's ability to resist erosion. A methodology for determining material erodibility resulting from the erosive power of water has been presented by Annandale (1993, 1995). He introduced a relationship between stream power and a geomechanical material classification system known as the erodibility index. This report applies his findings to bridge scour analysis and presents an interim procedure for estimating bridge scour depths in bedrock and other materials defined by the erodibility index. The recommendations in this report are currently being applied as an interim method for evaluating bridge scour at the Colorado Department of Transportation. Further laboratory study is planned to refine the relationship between energy dissipation at bridge piers and pier geometry. Findings from this study will be made available in a subsequent report. AN - dot:93740 DA - 1994-12-01 ET - Interim Report: 12/93 to 09/94 KW - Bridges KW - Scour KW - Bedrock KW - Depth KW - Estimating KW - Forecasting KW - Future KW - Power KW - Research KW - Streams KW - Bridge Scour KW - Erodibility KW - Stream Power KW - Energy Dissipation KW - Erodibility Index LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-R-SD-94-14 TI - Preliminary Procedure to Predict Scour in Bedrock M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93740 ER -
Short-Term Aging of Hot Mix Asphalt

Aschenbrener, Timothy B. ;

Far, Nava

1994-12-01 | PDF

Short-term aging is defined as the hardening or stiffening of the asphalt cement as well as the asphalt cement absorption into the aggregate as a result of the construction process. The asphalt cement ages during construction when the hot mix asphalt (HMA) is at elevated temperatures. This occurs during mixing, storage, hauling, placing, and compac ...

10/05/2026

Title : Short-Term Aging of Hot Mix Asphalt Creator(s) : Aschenbrener, Timothy B.;Far, Nava; Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1994-12-01 Report Number : CDOT-DTD-R-94-11 URL : https://rosap.ntl.bts.gov/view/dot/93739
Aschenbrener, T. B., & Far, N. (1994). Short-Term Aging of Hot Mix Asphalt (Report No. CDOT-DTD-R-94-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93739

Aschenbrener, Timothy B. and Nava Far. Short-Term Aging of Hot Mix Asphalt. Report no. CDOT-DTD-R-94-11. Colorado. Department of Transportation, 1994. https://rosap.ntl.bts.gov/view/dot/93739.

Aschenbrener, Timothy B., and Nava Far Short-Term Aging of Hot Mix Asphalt. Colorado. Department of Transportation, 1994, Report no. CDOT-DTD-R-94-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93739.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. AU - Far, Nava A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Short-term aging is defined as the hardening or stiffening of the asphalt cement as well as the asphalt cement absorption into the aggregate as a result of the construction process. The asphalt cement ages during construction when the hot mix asphalt (HMA) is at elevated temperatures. This occurs during mixing, storage, hauling, placing, and compaction operations. The purpose of this study was to investigate the length of time to short-term age samples mixed in the laboratory in order to simulate the short-term aging that is received in the field. This was done by: 1) measuring the amount of time the HMA stays at elevated temperatures in the field, 2) comparing the quantity of asphalt absorption into the aggregate between field produced and laboratory mixed samples, and 3) comparing test results from the Hamburg wheel-tracking device between field produced and laboratory mixed samples. A previous study has shown the Hamburg wheel-tracking device is very sensitive to short-term aging. Information gathered from the field indicated that the HMA stayed at elevated temperatures for approximately 1 to 2 hours for a majority of projects. Based on test results from asphalt absorption, the short-term aging time should be 2 to 4 hours; based on test results from the Hamburg wheel-tracking device, the short-term aging should be between 1 and 3 hours. As expected, the length of short-term aging in the field is quite variable because of the variable field conditions and material properties. It was recommended to short-term age samples mixed in the laboratory for 2 hours to simulate the field aging. AN - dot:93739 DA - 1994-12-01 ET - Final Report KW - Hot mix asphalt KW - Tracking systems KW - Absorption KW - Alternatives analysis KW - Field studies KW - Laboratory tests KW - Time duration KW - Asphalt cement KW - short-term aging KW - asphalt absorption KW - Hamburg wheel-tracking device LA - English PB - Colorado. Department of Transportation PY - 1994 SN - CDOT-DTD-R-94-11 TI - Short-Term Aging of Hot Mix Asphalt M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93739 ER -
Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies

Wapelhorst, Leo ;

Hazelwood, Carl

1981-09-01 | PDF

This report describes the test procedures and results of the Discrete Address Beacon System (DABS) and Air Traffic Control Radar Beacon System (ATCRBS) compatibility studies performed at the Federal Aviation Administration (FAA) Technical Center. Four terminal ATCRBS processors: Automated Radar Terminal System (ARTS III), ARTS IIIA Sensor Receiver ...

10/05/2026

Title : Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies Creator(s) : Wapelhorst, Leo;Hazelwood, Carl;Pagano, Thomas; Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration Published Date : 1981-09-01 Report Number : FAA-RD-8l-l8 URL : https://rosap.ntl.bts.gov/view/dot/93738
Wapelhorst, L., Hazelwood, C., & Pagano, T. (1981). Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies (Report No. FAA-RD-8l-l8). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93738

Wapelhorst, Leo, Carl Hazelwood, and Thomas Pagano. Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies. Report no. FAA-RD-8l-l8. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1981. https://rosap.ntl.bts.gov/view/dot/93738.

Wapelhorst, Leo, et al. Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1981, Report no. FAA-RD-8l-l8, ROSA P. https://rosap.ntl.bts.gov/view/dot/93738.
Export RIS Citation Information. TY - Tech Report AU - Wapelhorst, Leo AU - Hazelwood, Carl AU - Pagano, Thomas A2 - United States. Department of Transportation. Federal Aviation Administration. Technical Center A3 - United States. Department of Transportation. Federal Aviation Administration AB - This report describes the test procedures and results of the Discrete Address Beacon System (DABS) and Air Traffic Control Radar Beacon System (ATCRBS) compatibility studies performed at the Federal Aviation Administration (FAA) Technical Center. Four terminal ATCRBS processors: Automated Radar Terminal System (ARTS III), ARTS IIIA Sensor Receiver and Processor (SRAP), ARTS II, an AN/TPX-42, and the en route common digitizer were subjected to various anticipated DABS/ATCRBS asynchronous reply (fruit) environments. Maximum expected DABS fruit rates will not degrade performance of facilities using defruited video. The common digitizer, which does not employ a defruiter, performed with no significant degradation in the various DABS fruit environments. The SRAP, which is planned to be implemented in terminal facilities to replace the existing ARTS III Beacon Data Acquisition Subsystem (BDAS), will experience overloading of reply and report buffers by the addition of DABS fruit if a defruiter is not used. A defruiter eliminates the overload conditions to the expected maximum DABS fruit rate but adversely affects the SRAP performance. AN - dot:93738 DA - 1981-09-01 ET - Final Report KW - Radar beacons KW - Air traffic control KW - Air traffic control radar beacon system KW - Electromagnetic compatibility LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1981 SN - FAA-RD-8l-l8 TI - Discrete Address Beacon System (DABS)/Air Traffic Control Radar Beacon System (ATCRBS) Electromagnetic Compatibility Studies M3 - Tech Report N1 - United States N1 - D34-241-620 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93738 ER -
Dynamic Traffic Modelling of the 1-25/HOV Corridor

Janson, Bruce ;

Robles, Juan

1995-01-01 | PDF

This report describes a test implementation of DYMOD (a dynamic traffic assignment model) as means of predicting time-varying traffic conditions in a moderate size urban network during congested periods and incidents. The study demonstrates how one component of a future traffic management center (i.e., the dynamic traffic model) can be implemented ...

10/05/2026

Title : Dynamic Traffic Modelling of the 1-25/HOV Corridor Creator(s) : Janson, Bruce;Robles, Juan; Corporate Creator(s) : University of Colorado at Denver Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1995-01-01 Report Number : CTI-UCD-95-11 URL : https://rosap.ntl.bts.gov/view/dot/93737
Janson, B., & Robles, J. (1995). Dynamic Traffic Modelling of the 1-25/HOV Corridor (Report No. CTI-UCD-95-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93737

Janson, Bruce and Juan Robles. Dynamic Traffic Modelling of the 1-25/HOV Corridor. Report no. CTI-UCD-95-11. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93737.

Janson, Bruce, and Juan Robles Dynamic Traffic Modelling of the 1-25/HOV Corridor. Colorado. Department of Transportation, 1995, Report no. CTI-UCD-95-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93737.
Export RIS Citation Information. TY - Tech Report AU - Janson, Bruce AU - Robles, Juan A2 - University of Colorado at Denver A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes a test implementation of DYMOD (a dynamic traffic assignment model) as means of predicting time-varying traffic conditions in a moderate size urban network during congested periods and incidents. The study demonstrates how one component of a future traffic management center (i.e., the dynamic traffic model) can be implemented and operated at a TMC to support traveler information systems and traffic management advisories. Based on nonlinear optimization formulations and solution algorithms, this modelling approach had already performed well in computational tests on small networks. Thus, DYMOD was ready for validation and testing on a suitable freeway /arterial system. The 1-25/HOV corridor southeast of Denver presented an excellent test environment for this application because of its (1) density of instrumentation, (2) rich diversity of highway types, and (3) dramatic variations in daily traffic conditions. AN - dot:93737 DA - 1995-01-01 ET - Final Report KW - Advanced traffic management systems KW - High occupancy vehicle lanes KW - Transportation corridors KW - Advanced traveler information systems KW - Freeways LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CTI-UCD-95-11 TI - Dynamic Traffic Modelling of the 1-25/HOV Corridor M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93737 ER -
Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado

Cohn, Louis F.

1995-02-01 | PDF

This report documents the test done on noise emission levels found on vehicles in Colorado. It justifies modifications of the STAMINA 2.0 traffic noise prediction model for use in Colorado. Vehicle noise emission measurements were made in accordance with FHWA Report No. DP-45-1R. It was determined that STAMINA 2.0 (with FHWA default emission rates) ...

10/05/2026

Title : Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado Creator(s) : Cohn, Louis F. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-R-TG-95-6 URL : https://rosap.ntl.bts.gov/view/dot/93736
Cohn, L. F. (1995). Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado (Report No. CDOT-R-TG-95-6). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93736

Cohn, Louis F.. Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado. Report no. CDOT-R-TG-95-6. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93736.

Cohn, Louis F. Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado. Colorado. Department of Transportation, 1995, Report no. CDOT-R-TG-95-6, ROSA P. https://rosap.ntl.bts.gov/view/dot/93736.
Export RIS Citation Information. TY - Tech Report AU - Cohn, Louis F. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report documents the test done on noise emission levels found on vehicles in Colorado. It justifies modifications of the STAMINA 2.0 traffic noise prediction model for use in Colorado. Vehicle noise emission measurements were made in accordance with FHWA Report No. DP-45-1R. It was determined that STAMINA 2.0 (with FHWA default emission rates) over predicts the noise levels by approximately 4 dBA and that adjustments to the emission rates in the model should be made. AN - dot:93736 DA - 1995-02-01 ET - Final Report: 9/93 to 1/94 KW - Adjustment factors KW - Computer models KW - Cost control KW - Forecasting KW - Motor vehicles KW - Noise barriers KW - Sound level KW - Traffic noise LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-R-TG-95-6 TI - Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93736 ER -
Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt

Aschenbrener, Timothy B.

1995-02-01 | PDF

A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and ...

10/05/2026

Title : Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt Creator(s) : Aschenbrener, Timothy B. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1995-02-01 Report Number : CDOT-DTD-R-95-7 URL : https://rosap.ntl.bts.gov/view/dot/93735
Aschenbrener, T. B. (1995). Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt (Report No. CDOT-DTD-R-95-7). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93735

Aschenbrener, Timothy B.. Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt. Report no. CDOT-DTD-R-95-7. Colorado. Department of Transportation, 1995. https://rosap.ntl.bts.gov/view/dot/93735.

Aschenbrener, Timothy B. Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt. Colorado. Department of Transportation, 1995, Report no. CDOT-DTD-R-95-7, ROSA P. https://rosap.ntl.bts.gov/view/dot/93735.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and the device used to measure the binder properties was the bending beam rheometer (BBR). The laboratory study was conducted to determine the variability of test results as an influence of 1) asphalt cement stiffness, 2) asphalt cement quantity, 3) mixes with various aggregate qualities, 4) aging, and 5) the presence of hydrated lime. The influence of the asphalt cement stiffness was the single largest factor that controlled the test results. The field study was performed with 9 sites of known thermal cracking performance. Correlation of the test results to the known field performance was not very good. The best correlation was with the fracture strength measured by the TSRST and the m-value from the BBR. For samples prepared and aged in the laboratory, the BBR results on the binder gave approximately 2 deg C warmer temperatures than the TSRST results on the mix. For field samples, the BBR results on the binder gave approximately 2 deg C cooler temperatures than the TSRST results on the mix. AN - dot:93735 DA - 1995-02-01 ET - Final Report KW - Thermal degradation KW - Field tests KW - Stiffness KW - Thermal stresses KW - Low temperature KW - Correlation analysis KW - Cracking KW - Fracture properties KW - Hot mix asphalt KW - Laboratory tests KW - Performance KW - Properties of materials KW - Rheometers KW - field performance KW - asphalt stiffness KW - Thermal-Stress KW - Restrained-Specimen Test (TSRST) KW - low temperature thermal cracking LA - English PB - Colorado. Department of Transportation PY - 1995 SN - CDOT-DTD-R-95-7 TI - Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93735 ER -

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