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.
The traditional Superpave (SP4) mix is designed at 4% air voids, while the mix is compacted at 7%-8% air voids in the field with the belief that the pavement will achieve 4% air voids or 96% density within a few years. However, several studies have reported that the maximum density that a pavement can achieve is about 94% or 6% air voids. Such high
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Tarefder, R. A., & Hasan, M. M. (2022). Superpave 5 Lab Mix Design Procedure (Report No. NM17MSC-01). New Mexico. Department of Transportation. Research Bureau. https://rosap.ntl.bts.gov/view/dot/86910
Tarefder, Rafiqul A. and Md Mehedi Hasan. Superpave 5 Lab Mix Design Procedure. Report no. NM17MSC-01. New Mexico. Department of Transportation. Research Bureau, 2022. https://rosap.ntl.bts.gov/view/dot/86910.
Tarefder, Rafiqul A., and Md Mehedi Hasan Superpave 5 Lab Mix Design Procedure. New Mexico. Department of Transportation. Research Bureau, 2022, Report no. NM17MSC-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/86910.
This study investigated the applicability of two performance grade (PG) binders: PG 64-28+ and PG 76-22+ in open graded friction course (OGFC) by comparing their performances to that of an existing PG 70-28+, which is the only binder currently being used in OGFC mixes in New Mexico. A goal of this study was to evaluate the effectiveness of New Mexi
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Tarefder, R. A., & Hasan, M. A. (2022). Long-Lasting Open Graded Friction Course (OGFC) for Surfacing New Mexico Roads (Report No. NM19MSC-02). New Mexico. Department of Transportation. Research Bureau. https://rosap.ntl.bts.gov/view/dot/86911
Tarefder, Rafiqul A. and Md Amanul Hasan. Long-Lasting Open Graded Friction Course (OGFC) for Surfacing New Mexico Roads. Report no. NM19MSC-02. New Mexico. Department of Transportation. Research Bureau, 2022. https://rosap.ntl.bts.gov/view/dot/86911.
Tarefder, Rafiqul A., and Md Amanul Hasan Long-Lasting Open Graded Friction Course (OGFC) for Surfacing New Mexico Roads. New Mexico. Department of Transportation. Research Bureau, 2022, Report no. NM19MSC-02, ROSA P. https://rosap.ntl.bts.gov/view/dot/86911.
Marked crosswalks are a type of traffic control device that indicate to drivers where to expect people crossing the street, indicate to pedestrians where to cross, and - in the case of a midblock location – create a legal crosswalk. Marked crosswalks can be either basic (e.g., transverse lines) or high-visibility (e.g., continental, bar pair, or la
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O’Brien, S. W., Ahmed, I., Chase, T., Searcy, S., Kearns, B., Pyo, K., & Zegeer, C. V. (2022). Yielding Compliance at High Visibility Crosswalks (Report No. FHWA/NC/2019-18). North Carolina Department of Transportation. Research and Development Unit. https://rosap.ntl.bts.gov/view/dot/64540
O’Brien, Sarah Worth, Ishtiak Ahmed, Thomas Chase, Sarah Searcy, Brendan Kearns, Kihyun Pyo, and Charles V. Zegeer. Yielding Compliance at High Visibility Crosswalks. Report no. FHWA/NC/2019-18. North Carolina Department of Transportation. Research and Development Unit, 2022. https://rosap.ntl.bts.gov/view/dot/64540.
O’Brien, Sarah Worth, et al. Yielding Compliance at High Visibility Crosswalks. North Carolina Department of Transportation. Research and Development Unit, 2022, Report no. FHWA/NC/2019-18, ROSA P. https://rosap.ntl.bts.gov/view/dot/64540.
Poor structural properties and nutrient profiles of disturbed soils often require supplemental organic matter for promoting better vegetation establishment. Compost and compost-related products, when added to soils, have proven to enhance plant growth and improve infiltration of rainwater, thereby mitigating soil erosion and excess nutrient release
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Aydilek, A., Davis, A. P., Lea-Cox, J., Ristvey, A., Pamuru, S., & Morash, J. (2022). Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth (Report No. SHA/UM/5-21). Maryland Department of Transportation. State Highway Administration. https://rosap.ntl.bts.gov/view/dot/78712
Aydilek, Ahmet, Allen P Davis, John Lea-Cox, Andrew Ristvey, Sai Pamuru, and Jennifer Morash. Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth. Report no. SHA/UM/5-21. Maryland Department of Transportation. State Highway Administration, 2022. https://rosap.ntl.bts.gov/view/dot/78712.
Aydilek, Ahmet, et al. Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth. Maryland Department of Transportation. State Highway Administration, 2022, Report no. SHA/UM/5-21, ROSA P. https://rosap.ntl.bts.gov/view/dot/78712.
This study evaluated the quality of crowdsourced Waze data (including reports and speed) and explored promising use scenarios of Waze data to facilitate the development of intelligent transportation in Tennessee. To this end, the thoroughly assessed Waze reports quality in terms of spatiotemporal accuracy and coverage. The study found Waze users re
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Gu, Y., Zhang, H., Brakewood, C., & Han, L. D. (2022). WAZE Data Reporting (Report No. RES2019-11). Tennessee. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/66932
Gu, Yangsong, Hairuilong Zhang, Candace Brakewood, and Lee D. Han. WAZE Data Reporting. Report no. RES2019-11. Tennessee. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/66932.
Gu, Yangsong, et al. WAZE Data Reporting. Tennessee. Department of Transportation, 2022, Report no. RES2019-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/66932.
This report summarizes the results of a study was conducted to identify efficient and cost-effective pothole patching treatments and provide recommendation for optimal methods and materials that various Local Public Agencies (LPAs) can use to enhance the performance and longevity of pothole patches installed during the winter season. To achieve the
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Nazzal, M. D., & Abbas, A. (2022). Winter Pothole Treatments for Local Roads [Fact Sheet]. Ohio. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86680
Nazzal, Munir D and Ala Abbas. Winter Pothole Treatments for Local Roads [Fact Sheet]. Ohio. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/86680.
Nazzal, Munir D, and Ala Abbas Winter Pothole Treatments for Local Roads [Fact Sheet]. Ohio. Department of Transportation, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/86680.
Ongoing assessment of system performance monitoring is critical to successful and efficient transportation planning, ensuring that infrastructure investments provide a desired return on investment. As with any new transportation facility, it is important to understand how Express Lane facilities affect travel behavior, resulting on-road vehicle act
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Guensler, R., Liu, H., Lu, H., Chang, C. H., Dai, Z., Xia, T., Fu, Z., Liu, D., Kim, D., Zhao, Y., & Guin, A. (2022). Georgia Express Lane Corridors Vehicle Occupancy and Throughput Study 2018-2020: Volume I: Vehicle and Person Throughput Analysis Before and After the I-75 Northwest Corridor and I-85 Express Lanes Extension. Georgia Institute of Technology. School of Civil and Environmental Engineering. https://rosap.ntl.bts.gov/view/dot/62687
Guensler, Randall, Haobing Liu, Hongyu Lu, Chia-Huai Chang, Ziyi Dai, Tian Xia, and Zixiu Fu, et al.. Georgia Express Lane Corridors Vehicle Occupancy and Throughput Study 2018-2020: Volume I: Vehicle and Person Throughput Analysis Before and After the I-75 Northwest Corridor and I-85 Express Lanes Extension. Georgia Institute of Technology. School of Civil and Environmental Engineering, 2022. https://rosap.ntl.bts.gov/view/dot/62687.
Guensler, Randall, et al. Georgia Express Lane Corridors Vehicle Occupancy and Throughput Study 2018-2020: Volume I: Vehicle and Person Throughput Analysis Before and After the I-75 Northwest Corridor and I-85 Express Lanes Extension. Georgia Institute of Technology. School of Civil and Environmental Engineering, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/62687.
University of Florida researchers conducted tests of a promising new permeameter, the vertical in situ permeameter (VIP), at sites across the state of Florida.
Florida. Department of Transportation (2022). Field Implementation of the Vertical In situ Permeameter (VIP) [Summary] (Report No. BDV31-977-88). Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/62340
Florida. Department of Transportation. Field Implementation of the Vertical In situ Permeameter (VIP) [Summary]. Report no. BDV31-977-88. Florida. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/62340.
Florida. Department of Transportation Field Implementation of the Vertical In situ Permeameter (VIP) [Summary]. Florida. Department of Transportation, 2022, Report no. BDV31-977-88, ROSA P. https://rosap.ntl.bts.gov/view/dot/62340.
Public transportation providers are constantly striving to maximize available resources in terms of cost and vehicle fleet to deliver high-quality services that allow passengers to finish their trips between origins and destinations in the time allotted. Even though buses and metro systems serve a vast number of people, some passengers may find the
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Mishra, S., Brakewood, C., Golias, M. M., Aravind, A., Venthuruthiyil, S. P., & Sharma, I. (2022). Connecting Demand Response Transit With Fixed Service Transit (Report No. RES-2021-03). Tennessee. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/62690
Mishra, Sabyasachee, Candace Brakewood, Mihalis M. Golias, Avani Aravind, Suvin P Venthuruthiyil, and Ishant Sharma. Connecting Demand Response Transit With Fixed Service Transit. Report no. RES-2021-03. Tennessee. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/62690.
Mishra, Sabyasachee, et al. Connecting Demand Response Transit With Fixed Service Transit. Tennessee. Department of Transportation, 2022, Report no. RES-2021-03, ROSA P. https://rosap.ntl.bts.gov/view/dot/62690.
MassDOT actively works with FHWA on the Manual for Assessing Safety Hardware (MASH) implementation. It is critical to plan and manage MASH upgrades and integrate the guardrail asset within its asset management plan with a complete guardrail inventory. This study aims at developing and validating new processes using automated methods to identify and
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Ai, C., & Hou, Q. (2022). Automated Guardrail Inventory and Condition Evaluation (Report No. 22-031). Massachusetts. Dept. of Transportation. Office of Transportation Planning. https://rosap.ntl.bts.gov/view/dot/63368
Ai, Chengbo and Qing Hou. Automated Guardrail Inventory and Condition Evaluation. Report no. 22-031. Massachusetts. Dept. of Transportation. Office of Transportation Planning, 2022. https://rosap.ntl.bts.gov/view/dot/63368.
Ai, Chengbo, and Qing Hou Automated Guardrail Inventory and Condition Evaluation. Massachusetts. Dept. of Transportation. Office of Transportation Planning, 2022, Report no. 22-031, ROSA P. https://rosap.ntl.bts.gov/view/dot/63368.
The purchasing power of Iowa’s primary transportation revenue source, the fuel tax, has decreased over time due to annual fuel tax revenues not keeping pace with the growth in costs. This study evaluated Iowa’s existing transportation funding sources and through a literature review, identified approaches being used around the country to increase tr
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Rouse, E., Shaw, J., Maletsky, K., DeFord, S., Neuman, A., Nlenanya, I., & Kanghah, F. F. (2022). Alternative Funding Approaches for Iowa Roads (Report No. IHRB Project TR-790). Iowa Highway Research Board. https://rosap.ntl.bts.gov/view/dot/79639
Rouse, Eric, John Shaw, Kiernan Maletsky, Sarah DeFord, Allison Neuman, Inya Nlenanya, and Farzaneh Faramarzi Kanghah. Alternative Funding Approaches for Iowa Roads. Report no. IHRB Project TR-790. Iowa Highway Research Board, 2022. https://rosap.ntl.bts.gov/view/dot/79639.
Rouse, Eric, et al. Alternative Funding Approaches for Iowa Roads. Iowa Highway Research Board, 2022, Report no. IHRB Project TR-790, ROSA P. https://rosap.ntl.bts.gov/view/dot/79639.
Nearly 4.6 million immigrants aged 65 and older live in the United States. This population is expected to more than triple in size by 2050. A lack of culturally appropriate transportation solutions for older immigrants creates disparities in access to services for older immigrant populations, increasing their risk of social isolation and reduced ph
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Mauldin, R., Mattingly, S., Parekh, R., Haque, M. M., Connolly, J. P., Thomas, L., Tarbet, Z., & Chowdhury, F. (2022). Transportation Behavior Among Older Vietnamese Immigrants in the Dallas-Fort Worth Metroplex: Well-Being, Geospatial Mobility, and Potential Indicators for Ride Providers’ Geospatial Burden (Report No. NITC-RR-1302). University of Texas at Arlington. https://rosap.ntl.bts.gov/view/dot/70378
Mauldin, Rebecca, Stephen Mattingly, Rupal Parekh, M. M. Haque, John P. Connolly, LaTisha Thomas, Zachary Tarbet, and Farzana Chowdhury. Transportation Behavior Among Older Vietnamese Immigrants in the Dallas-Fort Worth Metroplex: Well-Being, Geospatial Mobility, and Potential Indicators for Ride Providers’ Geospatial Burden. Report no. NITC-RR-1302. University of Texas at Arlington, 2022. https://rosap.ntl.bts.gov/view/dot/70378.
Mauldin, Rebecca, et al. Transportation Behavior Among Older Vietnamese Immigrants in the Dallas-Fort Worth Metroplex: Well-Being, Geospatial Mobility, and Potential Indicators for Ride Providers’ Geospatial Burden. University of Texas at Arlington, 2022, Report no. NITC-RR-1302, ROSA P. https://rosap.ntl.bts.gov/view/dot/70378.
The quality of the air void system in concrete is critical for the freeze-thaw durability and service life of concrete structures. In Tennessee, the current Tennessee Department of Transportation (TDOT) specification only specifies the air content for fresh concrete mixes. Currently, the most widely used methods to evaluate the freeze-thaw durabili
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Huang, B., Ma, Z. J., Wang, Y., Lu, H., & Polaczyk, P. (2022). Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes Through Improved Air Void Testing (Report No. RES2020-09). Tennessee. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/62711
Huang, Baoshan, Z John Ma, Yanhai Wang, Hang Lu, and Pawel Polaczyk. Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes Through Improved Air Void Testing. Report no. RES2020-09. Tennessee. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/62711.
Huang, Baoshan, et al. Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes Through Improved Air Void Testing. Tennessee. Department of Transportation, 2022, Report no. RES2020-09, ROSA P. https://rosap.ntl.bts.gov/view/dot/62711.
Microtransit is an emerging, technology-enabled, on-demand transportation mode whereby small shuttles provide shared rides through flexible routing and scheduling in response to customers’ requests for rides. Given its potential to address the equity and accessibility needs of the public, public transportation agencies are experimenting with this s
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Xing, Y., Pike, S., Pourrahmani, E., Handy, S., & Wang, Y. (2022). Exploring the Consumer Market of Microtransit Services in the Sacramento Area, California (Report No. NCST-UCD-RR-22-16). National Center for Sustainable Transportation (NCST) (UTC). https://doi.org/10.7922/G2HX1B0S
Xing, Yan, Susan Pike, Elham Pourrahmani, Susan Handy, and Yunshi Wang. Exploring the Consumer Market of Microtransit Services in the Sacramento Area, California. Report no. NCST-UCD-RR-22-16. National Center for Sustainable Transportation (NCST) (UTC), 2022. https://doi.org/10.7922/G2HX1B0S.
Xing, Yan, et al. Exploring the Consumer Market of Microtransit Services in the Sacramento Area, California. National Center for Sustainable Transportation (NCST) (UTC), 2022, Report no. NCST-UCD-RR-22-16, ROSA P. https://doi.org/10.7922/G2HX1B0S.
Moisture damage is one of the major types of asphalt pavement distress along with rutting, fatigue cracking and low-temperature cracking. Moisture, in liquid or gas form, penetrates into the interface between aggregate and asphalt and strips aggregate particles of asphalt coating, resulting in stripping and raveling. The Tennessee Department of Tra
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Huang, B., Xiao, R., & Polaczyk, P. (2022). Mitigating Stripping in Asphalt Mixtures (Report No. RES2020-07). Tennessee. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/62684
Huang, Baoshan, Rui Xiao, and Pawel Polaczyk. Mitigating Stripping in Asphalt Mixtures. Report no. RES2020-07. Tennessee. Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/62684.
Huang, Baoshan, et al. Mitigating Stripping in Asphalt Mixtures. Tennessee. Department of Transportation, 2022, Report no. RES2020-07, ROSA P. https://rosap.ntl.bts.gov/view/dot/62684.
The objective of this project is to compare the most recent ODOT procedures to currently recommended FHWA practices for predicting scour, and to develop a user-friendly spreadsheet solution for calculating/predicting scour at a structure based on the latest procedures. Examples of how to use the scour prediction tool are illustrated in the report.
Che, D., White, K., Narsavage, P., Khoury, I., & Rothwell, D. (2022). Division of Engineering Research on Call Agreement #34652 Task #3 – Scour Prediction Tools (Report No. FHWA/ODOT-2022/12). Ohio. Department of Transportation. Office of Statewide Planning and Research. https://rosap.ntl.bts.gov/view/dot/64264
Che, Daniel, Kevin White, Peter Narsavage, Issam Khoury, and David Rothwell. Division of Engineering Research on Call Agreement #34652 Task #3 – Scour Prediction Tools. Report no. FHWA/ODOT-2022/12. Ohio. Department of Transportation. Office of Statewide Planning and Research, 2022. https://rosap.ntl.bts.gov/view/dot/64264.
Che, Daniel, et al. Division of Engineering Research on Call Agreement #34652 Task #3 – Scour Prediction Tools. Ohio. Department of Transportation. Office of Statewide Planning and Research, 2022, Report no. FHWA/ODOT-2022/12, ROSA P. https://rosap.ntl.bts.gov/view/dot/64264.
Work zone safety is a high priority for transportation agencies across the United States. High speeds in construction zones are a well-documented risk factor that increases the frequency and severity of crashes. It is therefore important to understand the extent and severity of high-speed vehicles in and around construction work zones. This study u
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Mathew, J. K., Desai, J., Li, H., & Bullock, D. M. (2022). Speed Enforcement in Work Zones and Synthesis on Cost-Benefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network (Report No. FHWA/IN/JTRP-2023/15). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317639
Mathew, Jijo K, Jairaj Desai, Howell Li, and Darcy M. Bullock. Speed Enforcement in Work Zones and Synthesis on Cost-Benefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network. Report no. FHWA/IN/JTRP-2023/15. Purdue University. Joint Transportation Research Program, 2022. https://doi.org/10.5703/1288284317639.
Mathew, Jijo K, et al. Speed Enforcement in Work Zones and Synthesis on Cost-Benefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network. Purdue University. Joint Transportation Research Program, 2022, Report no. FHWA/IN/JTRP-2023/15, ROSA P. https://doi.org/10.5703/1288284317639.
This Pooled Fund project [Transportation Pooled Fund Study TPF-5(351)] was aimed at developing and demonstrating a new type of self-de-icing LED signal for highway intersections as a replacement for existing LED signal lights that remain too cold to prevent snow, sleet, and ice buildup on the lens and could cause accidents in snowy conditions. The
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Cai, H., Schrock, S., & Fitzsimmons, E. J. (2022). Self-de-icing LED Signal (Report No. FHWA-KS-22-04). Kansas Department of Transportation. Bureau of Research. https://rosap.ntl.bts.gov/view/dot/62342
Cai, Hongyi, Steven Schrock, and Eric J. Fitzsimmons. Self-de-icing LED Signal. Report no. FHWA-KS-22-04. Kansas Department of Transportation. Bureau of Research, 2022. https://rosap.ntl.bts.gov/view/dot/62342.
Cai, Hongyi, et al. Self-de-icing LED Signal. Kansas Department of Transportation. Bureau of Research, 2022, Report no. FHWA-KS-22-04, ROSA P. https://rosap.ntl.bts.gov/view/dot/62342.
This report was commissioned to gather information on the current practices of fog seal over chip seal that are being used by Cities and Counties within Minnesota. The report discusses current best practices and value added when compared to a stand-alone chip seal project. The information provided in this report was based off survey results from mu
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Rief, M. J., Indihar, M., & DeMenge, C. (2022). Effectiveness of Fog Seal on Chip Sealed Low Volume Roads (Report No. MN 2022RIC04). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/74717
Rief, Michael J, Matthew Indihar, and Chad DeMenge. Effectiveness of Fog Seal on Chip Sealed Low Volume Roads. Report no. MN 2022RIC04. Minnesota. Department of Transportation. Office of Research & Innovation, 2022. https://rosap.ntl.bts.gov/view/dot/74717.
Rief, Michael J, et al. Effectiveness of Fog Seal on Chip Sealed Low Volume Roads. Minnesota. Department of Transportation. Office of Research & Innovation, 2022, Report no. MN 2022RIC04, ROSA P. https://rosap.ntl.bts.gov/view/dot/74717.
The objective of this systemic analysis of bicycle and pedestrian safety in Utah was to identify risk factors, potential treatment sites, and potential countermeasures. The systemic approach to roadway safety management is a proactive means of identifying risk factors, countermeasures, and (high-risk, rather than just high-crash) treatment location
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Singleton, P. A., Rahman, M. R., & Burbidge, S. K. (2022). Systemic Analysis of Bicycle and Pedestrian Safety in Utah (Report No. UT-22.07). Utah Department of Transportation. https://rosap.ntl.bts.gov/view/dot/62355
Singleton, Patrick A., Md Rafiur Rahman, and Shaunna K. Burbidge. Systemic Analysis of Bicycle and Pedestrian Safety in Utah. Report no. UT-22.07. Utah Department of Transportation, 2022. https://rosap.ntl.bts.gov/view/dot/62355.
Singleton, Patrick A., et al. Systemic Analysis of Bicycle and Pedestrian Safety in Utah. Utah Department of Transportation, 2022, Report no. UT-22.07, ROSA P. https://rosap.ntl.bts.gov/view/dot/62355.
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