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.
As utility infrastructure increasingly occupies public roadway rights of way (ROWs), Iowa faces growing challenges in coordinating utility installations and managing space efficiently. The lack of standardized oversight across cities, counties, and the Iowa Department of Transportation (DOT) has led to inconsistent practices, disorganized utility p
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Sturgill, R., Adebiyi, J., Anspach, J., & Cooper, J. (2025). Best Practices for Utility Management in the Public Right of Way (Report No. InTrans Project 21-775). Iowa State University. Institute for Transportation. https://rosap.ntl.bts.gov/view/dot/89149
Sturgill, Roy, Jeremiah Adebiyi, James Anspach, and Jesse Cooper. Best Practices for Utility Management in the Public Right of Way. Report no. InTrans Project 21-775. Iowa State University. Institute for Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/89149.
Sturgill, Roy, et al. Best Practices for Utility Management in the Public Right of Way. Iowa State University. Institute for Transportation, 2025, Report no. InTrans Project 21-775, ROSA P. https://rosap.ntl.bts.gov/view/dot/89149.
Work zones along interstates often have increased congestion and crash rates when locations are close to or over capacity. Having agile monitoring methods to identifying emerging issues and challenges can provide data to transportation agency decision makers to refine maintenance of traffic plans and inform future designs. This study developed tech
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Bullock, D. M., & Desai, J. (2025). Continued Deployment of Indiana Work Zone Analytics [Brief]. Purdue University. Joint Transportation Research Program. https://rosap.ntl.bts.gov/view/dot/90505
Bullock, Darcy M. and Jairaj Desai. Continued Deployment of Indiana Work Zone Analytics [Brief]. Purdue University. Joint Transportation Research Program, 2025. https://rosap.ntl.bts.gov/view/dot/90505.
Bullock, Darcy M., and Jairaj Desai Continued Deployment of Indiana Work Zone Analytics [Brief]. Purdue University. Joint Transportation Research Program, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/90505.
The Illinois Department of Transportation (IDOT) began conducting pavement performance monitoring surveys on mechanistic-empirical designed pavements in 1986. These surveys and analyses provide the necessary data to verify and validate the design procedures and life-cycle cost models used in the pavement selection process. The pavement distress sur
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Illinois. Department of Transportation (2025). 2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements (Report No. FHWA/IL/PRR-180). Illinois. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/89276
Illinois. Department of Transportation. 2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements. Report no. FHWA/IL/PRR-180. Illinois. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/89276.
Illinois. Department of Transportation 2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements. Illinois. Department of Transportation, 2025, Report no. FHWA/IL/PRR-180, ROSA P. https://rosap.ntl.bts.gov/view/dot/89276.
This study examines commercial motor vehicle (CMV) crash severity in Idaho state from 2014–2023 by linking several state and federal databases to create an integrated analysis dataset. After filtering for completeness, 13,701 CMV-involved crashes were modeled using binary logistic regression to estimate the association between temporal, roadway, en
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Ridgeway, C., Soccolich, S., & Camden, M. C. (2025). Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes? (Report No. FHWA-ID-25-318). Idaho Transportation Department. https://rosap.ntl.bts.gov/view/dot/90150
Ridgeway, Christie, Susan Soccolich, and Matthew C. Camden. Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?. Report no. FHWA-ID-25-318. Idaho Transportation Department, 2025. https://rosap.ntl.bts.gov/view/dot/90150.
Ridgeway, Christie, et al. Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?. Idaho Transportation Department, 2025, Report no. FHWA-ID-25-318, ROSA P. https://rosap.ntl.bts.gov/view/dot/90150.
Chip seals are a cost-effective pavement preservation treatment widely used by the New Mexico Department of Transportation (NMDOT) to extend pavement life and improve surface performance. Despite their extensive application, NMDOT has not previously adopted a standardized design procedure or construction specification, resulting in variability acro
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Vargas-Nordcbeck, A., Chen, C., Earls, B., & Mann, J. (2025). Chip Seal for Uniform Usages Across the Districts of NMDOT. New Mexico. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92351
Vargas-Nordcbeck, Adriana, Chen Chen, Brooke Earls, and Jeffrey Mann. Chip Seal for Uniform Usages Across the Districts of NMDOT. New Mexico. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/92351.
Vargas-Nordcbeck, Adriana, et al. Chip Seal for Uniform Usages Across the Districts of NMDOT. New Mexico. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/92351.
Transportation capital investment planning plays a crucial role in shaping infrastructure that supports community growth and well-being. While many studies have examined capital investment decisions within specific jurisdictions, there is limited understanding of how equity is defined, measured, and integrated into these processes more broadly. Thi
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Sarmiento, C. F., Roy, A., Cheng, Y., Douma, F., & Zhao, J. (2025). Advancing Equity in Capital Investment Decision-Making (Report No. MN 2026-02). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/92413
Sarmiento, Camila Fonseca, Alan Roy, Yuan Cheng, Frank Douma, and Jerry Zhao. Advancing Equity in Capital Investment Decision-Making. Report no. MN 2026-02. Minnesota. Department of Transportation. Office of Research & Innovation, 2025. https://rosap.ntl.bts.gov/view/dot/92413.
Sarmiento, Camila Fonseca, et al. Advancing Equity in Capital Investment Decision-Making. Minnesota. Department of Transportation. Office of Research & Innovation, 2025, Report no. MN 2026-02, ROSA P. https://rosap.ntl.bts.gov/view/dot/92413.
This study examines how asphalt mixtures change over time and how their performance is influenced by material selection and environmental factors. Thirty-six asphalt mixes produced in Oklahoma were collected and tested to understand their behavior in terms of cracking, rutting, moisture damage, and compaction. The work focuses on how aging affects
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Elkashef, M., Mishra, D. (., Rad, S. M., Olagunju, M., Sadeghi, M., & Gbolade, A. (2025). Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement (Report No. FHWA-OK-26-01). Oklahoma. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92750
Elkashef, Mohamed, Debakanta (Deb) Mishra, Sina Mousavi Rad, Michael Olagunju, Mehdi Sadeghi, and Adeoluwa Gbolade. Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement. Report no. FHWA-OK-26-01. Oklahoma. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/92750.
Elkashef, Mohamed, et al. Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement. Oklahoma. Department of Transportation, 2025, Report no. FHWA-OK-26-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/92750.
Under the Moving Ahead for Progress in the 21st Century Act, state departments of transportation are required to report travel time reliability and set performance targets for interstate and non-interstate National Highway System facilities. Although several Virginia Transportation Research Council studies have analyzed and predicted travel time re
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Zhao, M., & Lan, C. L. (2025). Modeling Travel Time Reliability for Non-Interstate National Highway System Routes (Report No. FHWA/VTRC 26-R23). Virginia Transportation Research Council (VTRC). https://rosap.ntl.bts.gov/view/dot/87738
Zhao, Mo and Chien-Lun Lan. Modeling Travel Time Reliability for Non-Interstate National Highway System Routes. Report no. FHWA/VTRC 26-R23. Virginia Transportation Research Council (VTRC), 2025. https://rosap.ntl.bts.gov/view/dot/87738.
Zhao, Mo, and Chien-Lun Lan Modeling Travel Time Reliability for Non-Interstate National Highway System Routes. Virginia Transportation Research Council (VTRC), 2025, Report no. FHWA/VTRC 26-R23, ROSA P. https://rosap.ntl.bts.gov/view/dot/87738.
Bridge scour is a leading cause of hydraulic-related bridge failures, yet current monitoring practices rely on periodic inspections that are insufficient during floods when scour activity accelerates. To address this gap, a low-cost (under $1,000 per unit) remote scour-monitoring system was developed and deployed on two scour critical bridges in Ge
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Yee, T., Yang, J. J., Oguzmert, M., Amirgholy, M., Kazemian, A., Sarkar, A., Alam, M. S., & Deng, P. (2025). Remote Bridge Health Monitoring for Scouring Using Cost-Efficient Sensing Technology (Report No. FHWA-GA-25-2219). Georgia. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87977
Yee, Tien, Jidong J. Yang, Metin Oguzmert, Mahyar Amirgholy, Alan Kazemian, Ajoy Sarkar, Md. Shamsul Alam, and Penghao Deng. Remote Bridge Health Monitoring for Scouring Using Cost-Efficient Sensing Technology. Report no. FHWA-GA-25-2219. Georgia. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87977.
Yee, Tien, et al. Remote Bridge Health Monitoring for Scouring Using Cost-Efficient Sensing Technology. Georgia. Department of Transportation, 2025, Report no. FHWA-GA-25-2219, ROSA P. https://rosap.ntl.bts.gov/view/dot/87977.
The Florida Department of Transportation (FDOT) along with the University of Florida (UF) and the City of Gainesville (CoG) implemented an Accelerated Innovation Deployment (AID Grant, FL17) Demonstration Project [1]. The UF AID, or pedestrian-bicycle safety project, deployed and tested pedestrian and bicyclist safety applications at signalized int
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Elefteriadou, L., Manjunatha, P., Mirzaei, M., & Favero, R. (2025). Evaluation of Gainesville Pedestrian-Bicyclists Connected Vehicle Pilot (Report No. BED31-977-23). Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93277
Elefteriadou, Lily, Pruthvi, Manjunatha, Mohammadreza Mirzaei, and Renan Favero. Evaluation of Gainesville Pedestrian-Bicyclists Connected Vehicle Pilot. Report no. BED31-977-23. Florida. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/93277.
Elefteriadou, Lily, et al. Evaluation of Gainesville Pedestrian-Bicyclists Connected Vehicle Pilot. Florida. Department of Transportation, 2025, Report no. BED31-977-23, ROSA P. https://rosap.ntl.bts.gov/view/dot/93277.
Researchers collected materials from five districts and produced laboratory FDR mixtures using emulsified and foamed asphalt, with and without additive. Researchers performed tests for indirect tensile strength, resilient modulus, unconfined compressive strength, and permanent deformation to evaluate strength and performance-related properties over
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Sebesta, S., Kim, J., Choi, K., & Taylor, R. (2025). Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report] (Report No. 0-7143). Texas A&M Transportation Institute. https://rosap.ntl.bts.gov/view/dot/88500
Sebesta, Stephen, Jinho Kim, Kunhee Choi, and Ross Taylor. Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]. Report no. 0-7143. Texas A&M Transportation Institute, 2025. https://rosap.ntl.bts.gov/view/dot/88500.
Sebesta, Stephen, et al. Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]. Texas A&M Transportation Institute, 2025, Report no. 0-7143, ROSA P. https://rosap.ntl.bts.gov/view/dot/88500.
This study identifies equity challenges in current transportation payment systems, specifically for transit, parking, and vehicle tolls. The methodology included comprehensive literature reviews, an inventory of 49 global transit systems, seven case studies, and expert interviews to assess payment accessibility, technical rules, interoperability, a
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Mata, S., Hamilton, M., Huang, C., Gahbauer, J., & Matute, J. (2025). Equity in Transportation Payments: A Study for the California Department of Transportation (Report No. CA25-4326). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90502
Mata, Stacy, Madi Hamilton, Caleb Huang, John Gahbauer, and Juan Matute. Equity in Transportation Payments: A Study for the California Department of Transportation. Report no. CA25-4326. California. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90502.
Mata, Stacy, et al. Equity in Transportation Payments: A Study for the California Department of Transportation. California. Department of Transportation, 2025, Report no. CA25-4326, ROSA P. https://rosap.ntl.bts.gov/view/dot/90502.
This report describes the project activities conducted at The University of Maine's VEMI Lab to address the increasing rate of vehicle-pedestrian collisions within the state of Maine and to improve older adult driving safety. Leveraging VEMI's experience with virtual reality environments, human-subject research, and the lab's fully immersive autono
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Brown, J. R., Fink, P. D. S., Movalia, R. M., Kastelein, M. E., James, K. J., Corey, R. R., & Giudice, N. A. (2025). Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine. University of Maine. https://rosap.ntl.bts.gov/view/dot/87520
Brown, Justin R., Paul D. S. Fink, Raina M. Movalia, Margaret E. Kastelein, Kyle J. James, Richard R. Corey, and Nicholas A. Giudice. Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine. University of Maine, 2025. https://rosap.ntl.bts.gov/view/dot/87520.
Brown, Justin R., et al. Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine. University of Maine, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/87520.
Notional vehicles are useful in evaluation and rating of existing bridges as well as in design of new bridges. According to current trends, the number of overloaded trucks continues to increase. Alabama Department of Transportation (ALDOT) needs an effective and rational approach to include permit vehicles in the analysis. Therefore, the objective
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Roszczenko, R., Luszczynska, A. K., & Nowak, A. S. (2025). Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama (Report No. 931-095). Auburn University. Highway Research Center. https://rosap.ntl.bts.gov/view/dot/88487
Roszczenko, Rafal, Aneta K. Luszczynska, and Andrzej S. Nowak. Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama. Report no. 931-095. Auburn University. Highway Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/88487.
Roszczenko, Rafal, et al. Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama. Auburn University. Highway Research Center, 2025, Report no. 931-095, ROSA P. https://rosap.ntl.bts.gov/view/dot/88487.
This research investigated the viability of novel glass-fiber reinforced thermoplastic (TP) composite rebars, manufactured using a continuous forming process, as a potential field-bendable and corrosion-proof alternative to conventional steel and commercial glass-fiber reinforced thermoset (TS) rebars. The study focused on TP composites using polyb
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Thapa, R., Bhandari, S., Lopez-Anido, R., & Frankhauser, W. (2025). Thermoplastic Composite Rebar Durability and Mechanical Testing (Report No. TIDC Project 2.25). Maine. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92263
Thapa, Rohan, Sunil Bhandari, Roberto Lopez-Anido, and Wayne Frankhauser. Thermoplastic Composite Rebar Durability and Mechanical Testing. Report no. TIDC Project 2.25. Maine. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/92263.
Thapa, Rohan, et al. Thermoplastic Composite Rebar Durability and Mechanical Testing. Maine. Department of Transportation, 2025, Report no. TIDC Project 2.25, ROSA P. https://rosap.ntl.bts.gov/view/dot/92263.
Hard-braking and hard-acceleration data have been demonstrated as an important emerging data source that provides quicker feedback than crash data. In fact, a strong correlation between hard braking on the interstate and crash rates has been reported in previous studies. A previous study has shown that there are approximately 147 hard braking event
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Sakhare, R. S., Desai, J., Gartner, C., Mukai, J., Sturdevant, N., Shellhamer, N., Ruble, T., McCoy, D., & Bullock, D. M. (2025). Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events (Report No. FHWA/IN/JTRP-2025/30). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284318579
Sakhare, Rahul Suryakant, Jairaj Desai, Christopher Gartner, Justin Mukai, Nathaniel Sturdevant, Nathaniel Shellhamer, Taylor Ruble, Daniel McCoy, and Darcy M. Bullock. Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events. Report no. FHWA/IN/JTRP-2025/30. Purdue University. Joint Transportation Research Program, 2025. https://doi.org/10.5703/1288284318579.
Sakhare, Rahul Suryakant, et al. Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/30, ROSA P. https://doi.org/10.5703/1288284318579.
Over the past 18 months, the team has performed several dozen after-action reviews of interstate work zones and the associated maintenance of traffic (MOT). These after-action reports generally contain the following information: Date, location, visual images, connected vehicle summary graphics, qualitative discussion of activity, and in some cases
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Overall, M. W., Mukai, J., Sakhare, R. S., Desai, J., Horton, D., & Bullock, D. M. (2025). Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements (Report No. FHWA/IN/JTRP-2025/29). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284318578
Overall, Myles W., Justin Mukai, Rahul Suryakant Sakhare, Jairaj Desai, Deborah Horton, and Darcy M. Bullock. Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements. Report no. FHWA/IN/JTRP-2025/29. Purdue University. Joint Transportation Research Program, 2025. https://doi.org/10.5703/1288284318578.
Overall, Myles W., et al. Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/29, ROSA P. https://doi.org/10.5703/1288284318578.
Construction inspection plays a pivotal role in ensuring the quality and long-term performance of infrastructure products. INDOT is currently facing the challenge to effectively train novice inspectors and update experienced inspectors with the latest versions of quality requirements to perform construction inspection effectively and more efficient
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Hong, Y., Zhang, Y., Hong, Z., Zheng, R., Cai, H., & Abraham, D. M. (2025). User Manual for Digital Inspection Training System (Report No. FHWA/IN/JTRP-2025/28). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284318594
Hong, Yeji, Yuxi Zhang, Zirui Hong, Ruisong Zheng, Hubo Cai, and Dulcy M. Abraham. User Manual for Digital Inspection Training System. Report no. FHWA/IN/JTRP-2025/28. Purdue University. Joint Transportation Research Program, 2025. https://doi.org/10.5703/1288284318594.
Hong, Yeji, et al. User Manual for Digital Inspection Training System. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/28, ROSA P. https://doi.org/10.5703/1288284318594.
The use of Portland Limestone Cement (PLC, Type 1L), a sustainable alternative to Ordinary Portland Cement (OPC), has gained traction in the United States as a means to reduce the carbon footprint associated with concrete production. Despite its environmental benefits, the inconsistent field performance, particularly with respect to strength develo
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Sung, J., He, R., Lu, N. (., & Feng, Y. (2025). Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction (Report No. FHWA/IN/JTRP-2025/27). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284318575
Sung, Jookyeung, Rui He, Na (Luna) Lu, and Yining Feng. Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction. Report no. FHWA/IN/JTRP-2025/27. Purdue University. Joint Transportation Research Program, 2025. https://doi.org/10.5703/1288284318575.
Sung, Jookyeung, et al. Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/27, ROSA P. https://doi.org/10.5703/1288284318575.
Since the 1960’s, bridge live loads (design axle loads) and truck volume have been continuously increasing. Truck loads and wheel configurations that bridge decks are designed for according to the AASHTO LRFD Bridge Design Specifications no longer reflect the modern trucks, not mentioning the larger permit vehicles (e.g., P-15) and new vehicle conf
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Wang, X., Ghoroubi, R., Grayson-Wallace, B., & Cheng, L. (2025). Refined Bridge Deck Design and Analysis (Report No. CA25-3668). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/90488
Wang, Xun, Rahim Ghoroubi, Brendan Grayson-Wallace, and Lijuan Cheng. Refined Bridge Deck Design and Analysis. Report no. CA25-3668. California. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/90488.
Wang, Xun, et al. Refined Bridge Deck Design and Analysis. California. Department of Transportation, 2025, Report no. CA25-3668, ROSA P. https://rosap.ntl.bts.gov/view/dot/90488.
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