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 report evaluates the feasibility of 3D scanning technologies, including LiDAR, terrestrial laser scanning (TLS), and UAV photogrammetry, for improving bridge inspection practices. The study identifies challenges in adopting these technologies, particularly for detecting corrosion, section loss, and deformation in steel girders and other critic
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Kang, K., Xiao, J., Hu, J., Kanakamedala, D. S. C., Seo, J., & Varma, A. (2025). Feasibility of 3D Scanning Technology for Bridge Inspection and Management (Report No. FHWA/IN/JTRP-2025/16). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317880
Kang, Kyubyung, Jinwu Xiao, Jiashu Hu, Deven Surya Chandan Kanakamedala, Jungil Seo, and Amit Varma. Feasibility of 3D Scanning Technology for Bridge Inspection and Management. Report no. FHWA/IN/JTRP-2025/16. Purdue University. Joint Transportation Research Program, 2025. https://doi.org/10.5703/1288284317880.
Kang, Kyubyung, et al. Feasibility of 3D Scanning Technology for Bridge Inspection and Management. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/16, ROSA P. https://doi.org/10.5703/1288284317880.
This project investigated the use of evolving machine vision technologies to improve asset management procedures. Machine vision is technology that enables machines to “see” and interpret images, similar to how humans see and understand the world. It includes capturing an image, analyzing the image, and then completing and action or decision based
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Minnesota. Department of Transportation (2025). Project Summary: Machine Vision for Asset Management (Report No. 2025-42). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87550
Minnesota. Department of Transportation. Project Summary: Machine Vision for Asset Management. Report no. 2025-42. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87550.
Minnesota. Department of Transportation Project Summary: Machine Vision for Asset Management. Minnesota. Department of Transportation, 2025, Report no. 2025-42, ROSA P. https://rosap.ntl.bts.gov/view/dot/87550.
Temporary bridges are systems designed for an expected service life of 5 years. In 2011, the California Department of Transportation issued a memo to designers advocating the use of design spectra corresponding to a return period of 100 years for temporary bridges. However, broad consensus on the most appropriate hazard level and design approach is
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Petrone, F., Kunnath, S. K., & Kashizadeh, S. (2025). Hazard-Based Risk and Cost-Benefit Assessment of Temporary Bridges in California (Report No. CA25-3945). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87054
Petrone, Floriana, Sashi K. Kunnath, and SeyyedMahdi Kashizadeh. Hazard-Based Risk and Cost-Benefit Assessment of Temporary Bridges in California. Report no. CA25-3945. California. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87054.
Petrone, Floriana, et al. Hazard-Based Risk and Cost-Benefit Assessment of Temporary Bridges in California. California. Department of Transportation, 2025, Report no. CA25-3945, ROSA P. https://rosap.ntl.bts.gov/view/dot/87054.
Roadside vegetation composition assessment is essential to maintain ecological stability, control invasive species, and to ensure the adoption of environmental regulations around construction zones. Traditional monitoring methods involving visual inspections are time-consuming, labor-intensive, and not scalable. Remote sensing offers a valuable alt
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Singh, P., Bao, Y., Perez, M. A., & Donald, W. N. (2025). Unmanned Aerial Systems for Determining Vegetative Establishment on ALDOT Construction Sites. Alabama. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85648
Singh, Puranjit, Yin Bao, Michael A Perez, and Wesley N. Donald. Unmanned Aerial Systems for Determining Vegetative Establishment on ALDOT Construction Sites. Alabama. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85648.
Singh, Puranjit, et al. Unmanned Aerial Systems for Determining Vegetative Establishment on ALDOT Construction Sites. Alabama. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85648.
Highway construction workers operate in high-stress, hazardous settings where they have to perform physically taxing labor in environments where exposure to variable weather conditions, heavy equipment, high volumes of vehicle traffic, and other conditions that induce stress and anxiety are the norm. Up to 70% of workers in this industry have repor
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Dadi, G. B., Taherpour, F., & Pope, C. (2025). Development of a Health and Wellness Assessment for KYTC Personnel (Report No. KTC-25-21). University of Kentucky Transportation Center. https://doi.org/10.13023/ktc.rr.2025.21
Dadi, Gabriel B., Farshid Taherpour, and Caitlin Pope. Development of a Health and Wellness Assessment for KYTC Personnel. Report no. KTC-25-21. University of Kentucky Transportation Center, 2025. https://doi.org/10.13023/ktc.rr.2025.21.
Dadi, Gabriel B., et al. Development of a Health and Wellness Assessment for KYTC Personnel. University of Kentucky Transportation Center, 2025, Report no. KTC-25-21, ROSA P. https://doi.org/10.13023/ktc.rr.2025.21.
This Research Summary is part of the final deliverable for Report 2025-32, "Evaluation of Corrugated Pipes Manufactured with Recycled Materials."
Pluimer, M., & Brenna, E. (2025). Evaluation of Corrugated Pipes Manufactured with Recycled Materials [Research Summary] (Report No. 2025-32RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88372
Pluimer, Michael and Erik Brenna. Evaluation of Corrugated Pipes Manufactured with Recycled Materials [Research Summary]. Report no. 2025-32RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88372.
Pluimer, Michael, and Erik Brenna Evaluation of Corrugated Pipes Manufactured with Recycled Materials [Research Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-32RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/88372.
Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr
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Savolainen, P. T., & Wagner, M. (2025). Enhancing Safety for Pedestrians and Bicyclists at Roundabouts [Research Summary]. Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85627
Savolainen, Peter T. and Mark Wagner. Enhancing Safety for Pedestrians and Bicyclists at Roundabouts [Research Summary]. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85627.
Savolainen, Peter T., and Mark Wagner Enhancing Safety for Pedestrians and Bicyclists at Roundabouts [Research Summary]. Minnesota. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85627.
This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance
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Mohammad, L. N., Akentuna, M., Boateng, K. A., & Pant, S. (2025). Assessment of Long-Term Performance of Louisiana Asphalt Pavements (Report No. FHWA/LA.25/711). Louisiana. Department of Transportation and Development. https://rosap.ntl.bts.gov/view/dot/85502
Mohammad, Louay N., Moses Akentuna, Kwadwo Ampadu Boateng, and Shasank Pant. Assessment of Long-Term Performance of Louisiana Asphalt Pavements. Report no. FHWA/LA.25/711. Louisiana. Department of Transportation and Development, 2025. https://rosap.ntl.bts.gov/view/dot/85502.
Mohammad, Louay N., et al. Assessment of Long-Term Performance of Louisiana Asphalt Pavements. Louisiana. Department of Transportation and Development, 2025, Report no. FHWA/LA.25/711, ROSA P. https://rosap.ntl.bts.gov/view/dot/85502.
Part-time shoulder use (PTSU) has emerged as an effective lane-use strategy to mitigate both recurrent and non-recurrent congestion. Given the operational and safety benefits associated with the US-23 Flex Route, this research project focused on evaluating the feasibility of PTSU on selected freeway corridors in Michigan that are prone to such cong
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Savolainen, P. T., Gates, T. J., Gupta, N., Abatan, A., Hill, M., Ceifetz, A. H., Zockaie, A., Kamjoo, E., & Ghamami, M. (2025). Identify Best Locations for New Flex-Route Projects Throughout the State of Michigan (Report No. SPR-1751). Michigan Department of Transportation. Research Administration. https://rosap.ntl.bts.gov/view/dot/85296
Savolainen, Peter T., Timothy J. Gates, Nischal Gupta, Akinfolarin Abatan, Matthew Hill, Andrew H. Ceifetz, Ali Zockaie, Ehsan Kamjoo, and Mehrnaz Ghamami. Identify Best Locations for New Flex-Route Projects Throughout the State of Michigan. Report no. SPR-1751. Michigan Department of Transportation. Research Administration, 2025. https://rosap.ntl.bts.gov/view/dot/85296.
Savolainen, Peter T., et al. Identify Best Locations for New Flex-Route Projects Throughout the State of Michigan. Michigan Department of Transportation. Research Administration, 2025, Report no. SPR-1751, ROSA P. https://rosap.ntl.bts.gov/view/dot/85296.
Alkali-silica reaction (ASR) remains a significant durability concern in concrete pavements, leading to internal cracking, surface deterioration, and loss of ride quality. Although preventive measures have reduced ASR in new construction, pavements built in Minnesota in the 1980s and 1990s continue to exhibit distress. This study evaluates maintena
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Bektas, F. (2025). Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights (Report No. 2025-29). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87595
Bektas, Fatih. Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights. Report no. 2025-29. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87595.
Bektas, Fatih Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights. Minnesota. Department of Transportation, 2025, Report no. 2025-29, ROSA P. https://rosap.ntl.bts.gov/view/dot/87595.
The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit
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Supporting Files
Torgashov, E. V., Anderson, N., & Casey, T. J. (2025). Shear Wave Velocity Measurements [Final Report, Appendices] (Report No. cmr 25-009). Missouri. Department of Transportation. https://hdl.handle.net/10355/108931
Torgashov, Evgeniy V., Neil Anderson, and Thomas J Casey. Shear Wave Velocity Measurements [Final Report, Appendices]. Report no. cmr 25-009. Missouri. Department of Transportation, 2025. https://hdl.handle.net/10355/108931.
Torgashov, Evgeniy V., et al. Shear Wave Velocity Measurements [Final Report, Appendices]. Missouri. Department of Transportation, 2025, Report no. cmr 25-009, ROSA P. https://hdl.handle.net/10355/108931.
This research report reviews best practices in pedestrian outreach and engagement from various state, regional, and city agencies that will guide pedestrian outreach for the New Mexico Department of Transportation (NMDOT) Pedestrian Safety Action Plan (PSAP). This report summarizes insights from interviews with government personnel overseeing pedes
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Ferenchak, N. N., & Lucaci, A. M. (2025). NMDOT Pedestrian Outreach Program (Report No. P924090). New Mexico. Department of Transportation. Research Bureau. https://rosap.ntl.bts.gov/view/dot/86531
Ferenchak, Nicholas N. and Ana M Lucaci. NMDOT Pedestrian Outreach Program. Report no. P924090. New Mexico. Department of Transportation. Research Bureau, 2025. https://rosap.ntl.bts.gov/view/dot/86531.
Ferenchak, Nicholas N., and Ana M Lucaci NMDOT Pedestrian Outreach Program. New Mexico. Department of Transportation. Research Bureau, 2025, Report no. P924090, ROSA P. https://rosap.ntl.bts.gov/view/dot/86531.
Current test procedures in TxDOT specification Item 300, “Asphalts, Oils, and Emulsions” were reviewed for relevance, applicability, accuracy, and practicality, and recommendations were made for improving the tests and specifications. New test procedures were developed, as identified, to fulfill needed changes. Data for new proposed test procedures
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Wei, Z., Komaragiri, S., Adwani, D., Rahman, S., Karki, P., Sotoodeh-Nia, Z., Hazlett, D., Bhasin, A., Chen, H., Zorigtbaatar, N., Zhou, F., Martin, A. E., & Goehl, D. (2025). Improving Testing Requirements in Item 300 of TxDOT Standard Specification (Report No. FHWA/TX-26/0-7073-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/87295
Wei, Ziyao, Satyavati Komaragiri, Dheeraj Adwani, Syeda Rahman, Pravat Karki, Zahra Sotoodeh-Nia, and Darren Hazlett, et al.. Improving Testing Requirements in Item 300 of TxDOT Standard Specification. Report no. FHWA/TX-26/0-7073-1. University of Texas at Austin. Center for Transportation Research, 2025. https://rosap.ntl.bts.gov/view/dot/87295.
Wei, Ziyao, et al. Improving Testing Requirements in Item 300 of TxDOT Standard Specification. University of Texas at Austin. Center for Transportation Research, 2025, Report no. FHWA/TX-26/0-7073-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/87295.
The scope of this study included a thorough evaluation of the short-term and long-term performance of Spray-on Rejuvenators (SORs) to assess their effectiveness in extending asphalt pavement life. Laboratory testing on cores extracted from field included a modified Bending Beam Rheometer (BBR) to measure creep stiffness at different temperatures (2
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Islam, T., Vaddy, P., Kutay, M. E., Haider, S. W., & Cetin, B. (2025). Evaluation of Proprietary Rejuvenators (Report No. 2025-39). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88363
Islam, Tanzila, Poornachandra Vaddy, Muhammed Emin Kutay, Syed W. Haider, and Bora Cetin. Evaluation of Proprietary Rejuvenators. Report no. 2025-39. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88363.
Islam, Tanzila, et al. Evaluation of Proprietary Rejuvenators. Minnesota. Department of Transportation, 2025, Report no. 2025-39, ROSA P. https://rosap.ntl.bts.gov/view/dot/88363.
The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t
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Mohammad, L. N., & Ma, Y. (2025). Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature (Report No. FHWA/LA.25/710). Louisiana. Department of Transportation and Development. https://rosap.ntl.bts.gov/view/dot/85500
Mohammad, Louay N. and Ye Ma. Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature. Report no. FHWA/LA.25/710. Louisiana. Department of Transportation and Development, 2025. https://rosap.ntl.bts.gov/view/dot/85500.
Mohammad, Louay N., and Ye Ma Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature. Louisiana. Department of Transportation and Development, 2025, Report no. FHWA/LA.25/710, ROSA P. https://rosap.ntl.bts.gov/view/dot/85500.
The potential for walking and cycling and related modes such as wheelchairs which we call “active transportation” throughout this playbook—to take center stage is demonstrated in cities worldwide. Amsterdam and Copenhagen are known to tourists and urban planners worldwide for their bicycle infrastructure. Throngs of pedestrians are a hallmark of po
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Millard-Ball, A., Reginald, M., Yusuf, Y., Bian, C., & Ng, W. (2025). Beyond Copenhagen: Walking and Cycling Success Stories from Cities Worldwide. University of California, Los Angeles. Institute of Transportation Studies. https://rosap.ntl.bts.gov/view/dot/86912
Millard-Ball, Adam, Monisha Reginald, Yasmina Yusuf, Christopher Bian, and Willa Ng. Beyond Copenhagen: Walking and Cycling Success Stories from Cities Worldwide. University of California, Los Angeles. Institute of Transportation Studies, 2025. https://rosap.ntl.bts.gov/view/dot/86912.
Millard-Ball, Adam, et al. Beyond Copenhagen: Walking and Cycling Success Stories from Cities Worldwide. University of California, Los Angeles. Institute of Transportation Studies, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/86912.
A 100-ft field implementation of the proposed solar snow fence was conducted In Glyndon, MN. The implementation process started with the manufacturing of solar stripe frames, U connection with steel posts, helical piling, electrical power harvest and storage, electrical use in snow melting, and monitoring of the solar snow fence systems. A 12-ft la
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Yang, M., & Gullickson, D. (2025). Solar Snow Fence Controls Drifting Snow While Generating Power [Implementation Summary]. Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85622
Yang, Mijia and Dan Gullickson. Solar Snow Fence Controls Drifting Snow While Generating Power [Implementation Summary]. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85622.
Yang, Mijia, and Dan Gullickson Solar Snow Fence Controls Drifting Snow While Generating Power [Implementation Summary]. Minnesota. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85622.
Truck Mounted Attenuators (TMAs) are designed to mitigate crash severity. Currently, TMA drivers rely on visual checks via driving mirrors to manually trigger warnings thus placing the duty on drivers. To address this limitation, the Automated TMA Warning System (AutoTMA) replaces or augments manual driver interventions with an AI-enabled, sensor-f
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Adu-Gyamfi, Y., Sun, C., Amo-Boateng, M., Gandi, G., & Owor, N. J. (2025). Audible Alert and TMA Lighting (Report No. cmr 25-007). Missouri. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85413
Adu-Gyamfi, Yaw, Carlos Sun, Mark Amo-Boateng, Gahan Gandi, and Neema Jakisa Owor. Audible Alert and TMA Lighting. Report no. cmr 25-007. Missouri. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85413.
Adu-Gyamfi, Yaw, et al. Audible Alert and TMA Lighting. Missouri. Department of Transportation, 2025, Report no. cmr 25-007, ROSA P. https://rosap.ntl.bts.gov/view/dot/85413.
This Research Summary is part of the final deliverable for Report 2025-24, "Development of a Process to Lower Global Warming Potential of Construction Materials."
Cooper, M. A., & Turgeon, C. M. (2025). Incorporating Sustainability into the Procurement Process [Research Summary] (Report No. 2025-24RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88384
Cooper, Michelle A. and Curtis M. Turgeon. Incorporating Sustainability into the Procurement Process [Research Summary]. Report no. 2025-24RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88384.
Cooper, Michelle A., and Curtis M. Turgeon Incorporating Sustainability into the Procurement Process [Research Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-24RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/88384.
Bats are a critical component of our natural world, and many species are at risk. Protecting roosting habitat is one way we can help conserve a variety of species. Although many bats use natural roosts, a growing number are adapting to anthropogenic structures due to habitat encroachment. In this study, we tested methods for detecting bats using br
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Roby, P. (2025). Testing Survey Methods for Detecting Bats Roosting in Bridges [Research Summary]. Missouri. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85313
Roby, Piper. Testing Survey Methods for Detecting Bats Roosting in Bridges [Research Summary]. Missouri. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85313.
Roby, Piper Testing Survey Methods for Detecting Bats Roosting in Bridges [Research Summary]. Missouri. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85313.
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