The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
This study presents a computational tool for predicting pavement performance using long-term temperature data from thermocouple trees embedded in three flexible and two rigid pavement sections at the MnROAD facility. The research leverages spectral and probabilistic analyses to assess thermal behavior and its impact on pavement condition. Temperatu
...
dos Santos, K., Marasteanu, M. O., Zhao, Z., Duarte, J. G. C. S., & Custis, S. (2025). A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data (Report No. 2025-40). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88362
dos Santos, Ketson, Mihai O. Marasteanu, Zifeng Zhao, Joao G C S Duarte, and Simon Custis. A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data. Report no. 2025-40. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88362.
dos Santos, Ketson, et al. A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data. Minnesota. Department of Transportation, 2025, Report no. 2025-40, ROSA P. https://rosap.ntl.bts.gov/view/dot/88362.
The Bismarck-Mandan Regional Intelligent Transportation Systems (ITS) Architecture was developed under the guidance of the Bismarck-Mandan Metropolitan Planning Organization (Bis-Man MPO). Initially created in 2005, this architecture has undergone four updates in 2008, 2013, 2021, and 2025. Its primary purpose is to guide the implementation of ITS
...
Hasan, S. (2025). Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]. North Dakota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88401
Hasan, Sharijad. Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]. North Dakota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88401.
Hasan, Sharijad Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]. North Dakota. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/88401.
This study investigated the mechanical strength and freeze-thaw durability of carbonate-based aggregate quarry by-products (QBs) stabilized with cement alone and in combination with calcined clay (metakaolin, MK) for potential use in pavement foundation layers. The primary objective was to evaluate the chemical and physical characteristics of dolom
...
Kong, T., Kothari, C., Qamhia, I. I. A., Tutumluer, E., & Garg, N. (2025). Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads (Report No. FHWA-ICT-25-013). Illinois Center for Transportation. https://doi.org/10.36501/0197-9191/25-013
Kong, Taeyun, Chirayu Kothari, Issam I. A. Qamhia, Erol Tutumluer, and Nishant Garg. Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads. Report no. FHWA-ICT-25-013. Illinois Center for Transportation, 2025. https://doi.org/10.36501/0197-9191/25-013.
Kong, Taeyun, et al. Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads. Illinois Center for Transportation, 2025, Report no. FHWA-ICT-25-013, ROSA P. https://doi.org/10.36501/0197-9191/25-013.
This Special Crash Investigations report documents the on-site investigation of the rollover crash of a 2019 Subaru Outback Limited in North Carolina in November 2022 driven by a belted 34-year-old female with a belted 70-year-old female front passenger. The Subaru crossed into the oncoming lane, traveling more than half a mile before veering off t
...
Crash Research & Analysis, Inc (2025). Special Crash Investigations: On-Site Rollover System Crash Investigation; Vehicle: 2019 Subaru Outback Limited; Location: North Carolina; Crash Date: November 2022 (Report No. DOT HS 813 715). United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis. https://doi.org/10.21949/0d3r-0d76
Crash Research & Analysis, Inc. Special Crash Investigations: On-Site Rollover System Crash Investigation; Vehicle: 2019 Subaru Outback Limited; Location: North Carolina; Crash Date: November 2022. Report no. DOT HS 813 715. United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis, 2025. https://doi.org/10.21949/0d3r-0d76.
Crash Research & Analysis, Inc Special Crash Investigations: On-Site Rollover System Crash Investigation; Vehicle: 2019 Subaru Outback Limited; Location: North Carolina; Crash Date: November 2022. United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis, 2025, Report no. DOT HS 813 715, ROSA P. https://doi.org/10.21949/0d3r-0d76.
This Special Crash Investigations report documents the fatal rollover crash of a 2019 Chevrolet Equinox that moved into the lane of a 2016 Honda CR-V. The Chevrolet went out of control, rolled down a dirt embankment and rolled over. The Chevrolet driver was pronounced deceased on-scene, and the belted 52-year-old front passenger was hospitalized fo
...
Dynamic Science, Inc. (2025). Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2019 Chevrolet Equinox; Location: California; Crash Date: October 2022 (Report No. DOT HS 813 714). United States. Department of Transportation. National Highway Traffic Safety Administration. https://doi.org/10.21949/vzcx-cb93
Dynamic Science, Inc.. Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2019 Chevrolet Equinox; Location: California; Crash Date: October 2022. Report no. DOT HS 813 714. United States. Department of Transportation. National Highway Traffic Safety Administration, 2025. https://doi.org/10.21949/vzcx-cb93.
Dynamic Science, Inc. Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2019 Chevrolet Equinox; Location: California; Crash Date: October 2022. United States. Department of Transportation. National Highway Traffic Safety Administration, 2025, Report no. DOT HS 813 714, ROSA P. https://doi.org/10.21949/vzcx-cb93.
Although visual inspections remain the primary method for bridge deck evaluation, they fail to detect hidden deterioration. Rapid-scanning nondestructive evaluation (NDE) techniques are gaining popularity, but their reliability compared with traditional methods is unclear. This study aimed to determine the reliability of multiple NDE methods for de
...
Balakumaran, S. S. G., & Behravan, A. (2025). Reliability of Nondestructive Evaluation of Concrete Bridge Decks (Report No. FHWA/VTRC 26-R25). Virginia Transportation Research Council (VTRC). https://rosap.ntl.bts.gov/view/dot/88329
Balakumaran, Soundar S G and Amir Behravan. Reliability of Nondestructive Evaluation of Concrete Bridge Decks. Report no. FHWA/VTRC 26-R25. Virginia Transportation Research Council (VTRC), 2025. https://rosap.ntl.bts.gov/view/dot/88329.
Balakumaran, Soundar S G, and Amir Behravan Reliability of Nondestructive Evaluation of Concrete Bridge Decks. Virginia Transportation Research Council (VTRC), 2025, Report no. FHWA/VTRC 26-R25, ROSA P. https://rosap.ntl.bts.gov/view/dot/88329.
Full depth reclamation (FDR) using emulsified asphalt or foamed asphalt continues to grow in usage throughout Texas. These mixtures typically use a cement additive in the mix design. The cement additive reportedly contributes to early strength gain, which can be particularly important for projects that require daily opening to heavy traffic. Howeve
...
Kim, J., Sebesta, S., Choi, K., & Taylor, R. (2025). Reducing Costs in Full Depth Reclamation (Report No. FHWA/TX-25/0-7143-R1). Texas A&M Transportation Institute. https://rosap.ntl.bts.gov/view/dot/88499
Kim, Jinho, Stephen Sebesta, Kunhee Choi, and Ross Taylor. Reducing Costs in Full Depth Reclamation. Report no. FHWA/TX-25/0-7143-R1. Texas A&M Transportation Institute, 2025. https://rosap.ntl.bts.gov/view/dot/88499.
Kim, Jinho, et al. Reducing Costs in Full Depth Reclamation. Texas A&M Transportation Institute, 2025, Report no. FHWA/TX-25/0-7143-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/88499.
This project spanning the year 2025 set up 17 additional City intersections, raising the total locations reporting data to 19. Note that similar to the NDDOT sponsored pilot project, this phase of traffic data collection and reporting used existing infrastructure without the need to purchase or maintain any additional traffic data collection device
...
Sharma, K. (2025). CenDak Signalized Intersections Traffic Data Collection – 2025. Upper Great Plains Transportation Institute. https://rosap.ntl.bts.gov/view/dot/89001
Sharma, Kshitij. CenDak Signalized Intersections Traffic Data Collection – 2025. Upper Great Plains Transportation Institute, 2025. https://rosap.ntl.bts.gov/view/dot/89001.
Sharma, Kshitij CenDak Signalized Intersections Traffic Data Collection – 2025. Upper Great Plains Transportation Institute, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/89001.
This report covers analyses of Caltrans’ near-fault adjustment factors as recommended in the Caltrans Seismic Design Criteria. The report has two large chapters. Chapter 1 builds on prior the University of California Los Angeles studies that performed probabilistic seismic hazard analyses at numerous California sites across a range of return period
...
Mazzoni, S., Zengin, E., Bahrampouri, M., & Bozorgnia, Y. (2025). New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC) (Report No. CA25-4417). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/89075
Mazzoni, Silvia, Ersa Zengin, Mahdi Bahrampouri, and Yousef Bozorgnia. New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC). Report no. CA25-4417. California. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/89075.
Mazzoni, Silvia, et al. New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC). California. Department of Transportation, 2025, Report no. CA25-4417, ROSA P. https://rosap.ntl.bts.gov/view/dot/89075.
Urban areas experience elevated pavement temperatures due to the urban heat island (UHI) effect, which increases cooling energy demand and associated carbon emissions. In this project, the work focused on three main components: (1) a comprehensive mechanical study of precast concrete mixes containing microencapsulated organic phase change material
...
DatasetSupporting Files
Radwan, I., Dessouky, S., & Sharif, H. (2025). Thermally Conductive Pre-cast Concrete Pavement for Urban Heat Island Mitigation [supporting dataset]. Transportation Infrastructure Precast Innovation Center (TRANS-IPIC) Tier-1 University Transportation Center (UTC). https://rosap.ntl.bts.gov/view/dot/89230
Radwan, Islam, Samer Dessouky, and Hatim Sharif. Thermally Conductive Pre-cast Concrete Pavement for Urban Heat Island Mitigation [supporting dataset]. Transportation Infrastructure Precast Innovation Center (TRANS-IPIC) Tier-1 University Transportation Center (UTC), 2025. https://rosap.ntl.bts.gov/view/dot/89230.
Radwan, Islam, et al. Thermally Conductive Pre-cast Concrete Pavement for Urban Heat Island Mitigation [supporting dataset]. Transportation Infrastructure Precast Innovation Center (TRANS-IPIC) Tier-1 University Transportation Center (UTC), 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/89230.
Elevated concentrations of air pollutants can have serious impacts on human health, the environment, and Colorado’s ecosystems. The Colorado Department of Transportation (CDOT) has prioritized protecting air quality in accordance with the Colorado Air Pollution Prevention and Control Act (Section 25-7-101 et seq., C.R.S., 2017). This research quant
...
Coffey, E., Cortez, G., Schmidt, M., Amaro, C. R., Hannigan, M. P., & Techera, U. D. (2025). Determining the Impact of CDOT Roadway Construction Projects on Air Quality (Report No. CDOT-2025-10). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88887
Coffey, Evan, Gabriela Cortez, Madelyn Schmidt, Carlos Rodriguez Amaro, Michael P. Hannigan, and Ulises D. Techera. Determining the Impact of CDOT Roadway Construction Projects on Air Quality. Report no. CDOT-2025-10. Colorado. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88887.
Coffey, Evan, et al. Determining the Impact of CDOT Roadway Construction Projects on Air Quality. Colorado. Department of Transportation, 2025, Report no. CDOT-2025-10, ROSA P. https://rosap.ntl.bts.gov/view/dot/88887.
Nighttime work zones pose increased risks for both drivers and workers due to the challenge of ensuring adequate visibility while minimizing glare. Current lighting practices vary widely across public agencies, often resulting in excessive illumination and poor glare control. This study evaluated the performance of nighttime lighting systems throug
...
Ho, C. H., Kim, K., Ren, K., & Allieu, N. (2025). The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety (Report No. TPF-5(438)). Smart Work Zone Deployment Initiative. https://rosap.ntl.bts.gov/view/dot/89904
Ho, Chun-Hsing, Kyungki Kim, Kewei Ren, and Nyawa Allieu. The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety. Report no. TPF-5(438). Smart Work Zone Deployment Initiative, 2025. https://rosap.ntl.bts.gov/view/dot/89904.
Ho, Chun-Hsing, et al. The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety. Smart Work Zone Deployment Initiative, 2025, Report no. TPF-5(438), ROSA P. https://rosap.ntl.bts.gov/view/dot/89904.
This objectives of this project were as follows: •Investigate how the characteristics of lighting—specifically glare, luminance, and visibility—affect the visual performance of construction workers. •Examine the influence of lighting arrangements (i.e., the orientation and positioning of light towers) on the perceptions of both construction workers
...
Ho, C. H., & Kim, K. (2025). The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety [Tech Transfer Summary] (Report No. TPF-5(438)). Smart Work Zone Deployment Initiative. https://rosap.ntl.bts.gov/view/dot/89905
Ho, Chun-Hsing and Kyungki Kim. The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety [Tech Transfer Summary]. Report no. TPF-5(438). Smart Work Zone Deployment Initiative, 2025. https://rosap.ntl.bts.gov/view/dot/89905.
Ho, Chun-Hsing, and Kyungki Kim The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety [Tech Transfer Summary]. Smart Work Zone Deployment Initiative, 2025, Report no. TPF-5(438), ROSA P. https://rosap.ntl.bts.gov/view/dot/89905.
United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2025-12-01
|
Traffic Safety Facts
|
PDF
In 2024 NHTSA began upgrading the Crash Investigation Sampling System (CISS) with provisions in the Infrastructure Investment and Jobs Act (IIJA), which said “to enhance the collection of crash data by upgrading the [CISS] to include – 1) additional data collection sites; 2) an expanded scope that includes all crash types; and 3) on-scene investiga
...
United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis (2025). Nonmotorist Crashes in the 2024 Crash Investigation Sampling System [Traffic Safety Facts] (Report No. DOT HS 813 770). United States. Department of Transportation. National Highway Traffic Safety Administration. https://doi.org/10.21949/zjze-je21
United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis. Nonmotorist Crashes in the 2024 Crash Investigation Sampling System [Traffic Safety Facts]. Report no. DOT HS 813 770. United States. Department of Transportation. National Highway Traffic Safety Administration, 2025. https://doi.org/10.21949/zjze-je21.
United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis Nonmotorist Crashes in the 2024 Crash Investigation Sampling System [Traffic Safety Facts]. United States. Department of Transportation. National Highway Traffic Safety Administration, 2025, Report no. DOT HS 813 770, ROSA P. https://doi.org/10.21949/zjze-je21.
Utility relocation at the Iowa Department of Transportation (Iowa DOT) is frequently cited as a cause of construction delays and increased highway project costs. This research aimed to enhance alignment between the utility coordination and project development processes by providing recommendations for integrating utility stakeholder partnerships ea
...
Sturgill, R. E., Victorio, S. A. M., Anspach, J. H., Taylor, T. R. B., Franklin, K., & Cooper, J. (2025). Project Development and Utility Coordination as a Partnership (Report No. 21-776). Iowa Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90104
Sturgill, Roy E., Shani A. Montes Victorio, James H. Anspach, Timothy R. B. Taylor, Kenny Franklin, and Jesse Cooper. Project Development and Utility Coordination as a Partnership. Report no. 21-776. Iowa Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90104.
Sturgill, Roy E., et al. Project Development and Utility Coordination as a Partnership. Iowa Department of Transportation, 2025, Report no. 21-776, ROSA P. https://rosap.ntl.bts.gov/view/dot/90104.
Since 2009, the Idaho Transportation Department (ITD) has implemented the Alive at 25 national program in Idaho. Each year, thousands of young Idaho drivers participate in the program to learn how to be better and safer on the road. To date, the impact of this program on driver behaviors and attitudes is unknown. ITD contracted Boise State Universi
...
May, M., McGinnis-Brown, L., Onaindia, M., & Lang, H. (2025). Idaho Alive at 25 Young Driver Education Program Evaluation (Report No. FHWA-ID-25-308). Idaho Transportation Department. https://rosap.ntl.bts.gov/view/dot/90131
May, Matthew, Lantz McGinnis-Brown, Maria Onaindia, and Hannah Lang. Idaho Alive at 25 Young Driver Education Program Evaluation. Report no. FHWA-ID-25-308. Idaho Transportation Department, 2025. https://rosap.ntl.bts.gov/view/dot/90131.
May, Matthew, et al. Idaho Alive at 25 Young Driver Education Program Evaluation. Idaho Transportation Department, 2025, Report no. FHWA-ID-25-308, ROSA P. https://rosap.ntl.bts.gov/view/dot/90131.
This report presents a new framework for applying fines content corrections in soil liquefaction evaluations. Fines content affects both penetration resistance and cyclic resistance, but current methods use a single correction to represent both effects. This study separates these influences by using variable-rate CPT data to assess the effect of fi
...
Renugah, V. N. S., Sahin, A., Brandenberg, S. J., & Stewart, J. P. (2025). Effect of Fines on Liquefaction Triggering Analyses (Report No. CA25-4418). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90480
Renugah, Varun N. S., Arda Sahin, Scott J. Brandenberg, and Jonathan P. Stewart. Effect of Fines on Liquefaction Triggering Analyses. Report no. CA25-4418. California. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90480.
Renugah, Varun N. S., et al. Effect of Fines on Liquefaction Triggering Analyses. California. Department of Transportation, 2025, Report no. CA25-4418, ROSA P. https://rosap.ntl.bts.gov/view/dot/90480.
The primary purpose of this research was to develop and propose procedures for incorporating partnerships with utility stakeholders into the early stages of the project development process at the Iowa Department of Transportation (Iowa DOT), with the broader goal of streamlining workflows to reduce utility-related delays and cost overruns.
Sturgill, R. (2025). Project Development and Utility Coordination as a Partnership [Tech Transfer Summary] (Report No. 21-776)). Iowa Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90112
Sturgill, Roy. Project Development and Utility Coordination as a Partnership [Tech Transfer Summary]. Report no. 21-776). Iowa Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90112.
Sturgill, Roy Project Development and Utility Coordination as a Partnership [Tech Transfer Summary]. Iowa Department of Transportation, 2025, Report no. 21-776), ROSA P. https://rosap.ntl.bts.gov/view/dot/90112.
Chloride-based brine deicers are widely used to maintain winter roadway safety, but their performance drops in extreme cold as meltwater dilutes the brine, and their runoff accelerates concrete deterioration, rebar corrosion, and ecological harm. This report investigates sustainable, high-performance deicing formulations that enhance low-temperatur
...
Yellavajjala, R. K., Afgan, S., Hesami, M., & Mahdi, M. R. (2025). Concentration Preserving Deicing Solutions for Higher Ice Melting (Report No. IHRB Project TR-814). Iowa Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90835
Yellavajjala, Ravi Kiran, Sher Afgan, Maedeh Hesami, and Muhammad Rafiul Mahdi. Concentration Preserving Deicing Solutions for Higher Ice Melting. Report no. IHRB Project TR-814. Iowa Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90835.
Yellavajjala, Ravi Kiran, et al. Concentration Preserving Deicing Solutions for Higher Ice Melting. Iowa Department of Transportation, 2025, Report no. IHRB Project TR-814, ROSA P. https://rosap.ntl.bts.gov/view/dot/90835.
This initiative constructed and studied a rapid strength gaining concrete mixture placed in MnROAD Test Cell 2437. The innovative concrete made from a belitic calcium sulfoaluminate (BCSA) cement was placed in a 36 ft by 12 ft test section on November 22, 2024, when the ambient temperature was approximately 35°F. The test cell was instrumented with
...
Izevbekhai, B. I., & Aydin, C. (2025). Construction & Early Performance of Rapid Strength Cement Concrete Mixture in MnROAD Test Cell 2437 (Report No. NRRA202601). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/92398
Izevbekhai, Bernard Igbafen and Ceren Aydin. Construction & Early Performance of Rapid Strength Cement Concrete Mixture in MnROAD Test Cell 2437. Report no. NRRA202601. Minnesota. Department of Transportation. Office of Research & Innovation, 2025. https://rosap.ntl.bts.gov/view/dot/92398.
Izevbekhai, Bernard Igbafen, and Ceren Aydin Construction & Early Performance of Rapid Strength Cement Concrete Mixture in MnROAD Test Cell 2437. Minnesota. Department of Transportation. Office of Research & Innovation, 2025, Report no. NRRA202601, ROSA P. https://rosap.ntl.bts.gov/view/dot/92398.
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.