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 design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal
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Nejad, S., & McGormley, J. C. (2024). Design Coefficients of Friction for MoDOT PTFE Bearings (Report No. CMR 24-005). Missouri. Department of Transportation. Construction and Materials Division. https://rosap.ntl.bts.gov/view/dot/75402
Nejad, Saeed and Jonathan C. McGormley. Design Coefficients of Friction for MoDOT PTFE Bearings. Report no. CMR 24-005. Missouri. Department of Transportation. Construction and Materials Division, 2024. https://rosap.ntl.bts.gov/view/dot/75402.
Nejad, Saeed, and Jonathan C. McGormley Design Coefficients of Friction for MoDOT PTFE Bearings. Missouri. Department of Transportation. Construction and Materials Division, 2024, Report no. CMR 24-005, ROSA P. https://rosap.ntl.bts.gov/view/dot/75402.
Recently, speed management practices have shifted away from an historical focus on the 85th percentile speed toward a safe systems approach that is focused on promoting safer speeds in all roadway environments through a combination of thoughtful, equitable, context-appropriate roadway design, appropriate speed-limit setting, targeted education, out
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Savolainen, P. T., Gates, T. J., Imosemi, S., Gupta, N., Gupta, G., & Megat-Johari, M. U. (2024). Complete Streets Speed Impacts (Report No. MN 2024-13). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/75514
Savolainen, Peter T., Timothy J. Gates, Sunday Imosemi, Nischal Gupta, Gagan Gupta, and Megat-Usamah Megat-Johari. Complete Streets Speed Impacts. Report no. MN 2024-13. Minnesota. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/75514.
Savolainen, Peter T., et al. Complete Streets Speed Impacts. Minnesota. Department of Transportation, 2024, Report no. MN 2024-13, ROSA P. https://rosap.ntl.bts.gov/view/dot/75514.
Across the United States, aging roadway infrastructure has led state departments of transportation (DOTs) to increase their focus on pavement rehabilitation projects. These projects upgrade existing infrastructure to meet the needs of current levels of vehicle use. On interstate rehabilitation projects, maintenance of traffic (MOT) is an especially
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Keathley, C., Griffith, R., & Catchings, R. (2024). Best Practices for Maintenance of Traffic on Interstate Pavement Rehabilitation Projects (Report No. KTC-24-34). University of Kentucky Transportation Center. https://doi.org/10.13023/ktc.rr.2024.34
Keathley, Catherine, Ryan Griffith, and Rachel Catchings. Best Practices for Maintenance of Traffic on Interstate Pavement Rehabilitation Projects. Report no. KTC-24-34. University of Kentucky Transportation Center, 2024. https://doi.org/10.13023/ktc.rr.2024.34.
Keathley, Catherine, et al. Best Practices for Maintenance of Traffic on Interstate Pavement Rehabilitation Projects. University of Kentucky Transportation Center, 2024, Report no. KTC-24-34, ROSA P. https://doi.org/10.13023/ktc.rr.2024.34.
This report examines the evolving landscape of technician training in Illinois’ transit industry, with a particular focus on electric vehicle (EV) technology. The report aims to identify the current challenges, explore collaborative training initiatives between community colleges and transit agencies, and provide actionable recommendations to the I
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Greenwood, R., & Reddy, M. R. D. (2024). Electrification of Illinois Transit: Bridging the Gap with Heavy-Duty Technician Training Initiatives (Report No. FHWA-ICT-24-014). Illinois Center for Transportation. https://doi.org/10.36501/0197-9191/24-016
Greenwood, Reggie and Meghana Reddy Dharma Reddy. Electrification of Illinois Transit: Bridging the Gap with Heavy-Duty Technician Training Initiatives. Report no. FHWA-ICT-24-014. Illinois Center for Transportation, 2024. https://doi.org/10.36501/0197-9191/24-016.
Greenwood, Reggie, and Meghana Reddy Dharma Reddy Electrification of Illinois Transit: Bridging the Gap with Heavy-Duty Technician Training Initiatives. Illinois Center for Transportation, 2024, Report no. FHWA-ICT-24-014, ROSA P. https://doi.org/10.36501/0197-9191/24-016.
Many state transportation agencies have introduced safety management systems (SMSs) to improve employee safety and health programs. These systems let employees quickly access safety and health policies, procedures, training, responsibilities, resources, and incident reporting tools, often electronically. Instituting a SMS is a critical step in adop
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Dadi, G. B., Nassereddine, H., Taherpour, F., & Pham, S. (2024). Development of a SMS Rollout Plan and Evaluation (Report No. KTC-24-33). University of Kentucky Transportation Center. https://doi.org/10.13023/ktc.rr.2024.33
Dadi, Gabriel B., Hala Nassereddine, Farshid Taherpour, and Salena Pham. Development of a SMS Rollout Plan and Evaluation. Report no. KTC-24-33. University of Kentucky Transportation Center, 2024. https://doi.org/10.13023/ktc.rr.2024.33.
Dadi, Gabriel B., et al. Development of a SMS Rollout Plan and Evaluation. University of Kentucky Transportation Center, 2024, Report no. KTC-24-33, ROSA P. https://doi.org/10.13023/ktc.rr.2024.33.
The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics to research Complete Streets best practices and assess New Jersey’s existing Complete Streets activities. The Complete Streets concept is comprised of approaches to planning, designing, and operating roadways and rights-of-way with all road users in mind, making the t
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Hopwood, C., Eskin, B., & Pal, M. (2024). NJDOT Complete Streets Assessment (Report No. NJ-2025-002). New Jersey. Department of Transportation. Bureau of Research. https://rosap.ntl.bts.gov/view/dot/84015
Hopwood, Cory, Ben Eskin, and Monika Pal. NJDOT Complete Streets Assessment. Report no. NJ-2025-002. New Jersey. Department of Transportation. Bureau of Research, 2024. https://rosap.ntl.bts.gov/view/dot/84015.
Hopwood, Cory, et al. NJDOT Complete Streets Assessment. New Jersey. Department of Transportation. Bureau of Research, 2024, Report no. NJ-2025-002, ROSA P. https://rosap.ntl.bts.gov/view/dot/84015.
Studies by the Federal Highway Administration show that American Indians have higher rates of pedestrian injury and death per capita than any other population group in the United States. The Minnesota Department of Transportation (MnDOT) has identified Native Americans as one of six priority populations in Minnesota that face disproportionate risks
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Lindsey, G., Hourdos, J., Coll, S., Petesch, M., Carretero, A., & Pritchard, H. (2024). Pedestrian Risk on Anishinaabe Reservations in Minnesota: Overview and Phase 2 Results (Report No. 2024-18). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/77728
Lindsey, Greg, John Hourdos, Sebastian Coll, Michael Petesch, Adrien Carretero, and Hannah Pritchard. Pedestrian Risk on Anishinaabe Reservations in Minnesota: Overview and Phase 2 Results. Report no. 2024-18. Minnesota. Department of Transportation. Office of Research & Innovation, 2024. https://rosap.ntl.bts.gov/view/dot/77728.
Lindsey, Greg, et al. Pedestrian Risk on Anishinaabe Reservations in Minnesota: Overview and Phase 2 Results. Minnesota. Department of Transportation. Office of Research & Innovation, 2024, Report no. 2024-18, ROSA P. https://rosap.ntl.bts.gov/view/dot/77728.
Four geophysical methods were comparatively assessed for their ability to detect subsurface anomalies/voids, namely, Electrical Resistivity Tomography (ERT), Multichannel Analysis of Surface Waves (MASW), Ground Penetrating Radar (GPR), and Full-Waveform Inversion (FWI). We found that: a. ERT is well-suited for detecting and localizing subsurface a
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Cai, M., Li, T., & Kallivokas, L. (2024). Evaluate Geophysical Methods to Detect Underground Voids (Report No. FHWA/TX-23/0-7071-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/75596
Cai, Mingwei, Tairan Li, and Loukas Kallivokas. Evaluate Geophysical Methods to Detect Underground Voids. Report no. FHWA/TX-23/0-7071-1. University of Texas at Austin. Center for Transportation Research, 2024. https://rosap.ntl.bts.gov/view/dot/75596.
Cai, Mingwei, et al. Evaluate Geophysical Methods to Detect Underground Voids. University of Texas at Austin. Center for Transportation Research, 2024, Report no. FHWA/TX-23/0-7071-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/75596.
People who walk and bike are the most vulnerable road users. However, understanding where they walk and bike requires continual data monitoring. Traditional methods rely on physical sensors in the infrastructure to detect the presence of pedestrians and bicyclists. However, these are expensive to deploy and only detect road users at the specific lo
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Barman, S., Levin, M. W., Lindsey, G., Petesch, M., Scotty, S., & Stern, R. (2024). Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows (Report No. MN 2024-19). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/77437
Barman, Simanta, Michael W. Levin, Gregory Lindsey, Michael Petesch, Suzy Scotty, and Raphael Stern. Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows. Report no. MN 2024-19. Minnesota. Department of Transportation. Office of Research & Innovation, 2024. https://rosap.ntl.bts.gov/view/dot/77437.
Barman, Simanta, et al. Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows. Minnesota. Department of Transportation. Office of Research & Innovation, 2024, Report no. MN 2024-19, ROSA P. https://rosap.ntl.bts.gov/view/dot/77437.
United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
2024-06-01
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OST-R Research Roundup
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News from across OST-R and its research community.
United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology (2024). OST-R Research Roundup Newsletter: June 2024. United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology. https://rosap.ntl.bts.gov/view/dot/76649
United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology. OST-R Research Roundup Newsletter: June 2024. United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology, 2024. https://rosap.ntl.bts.gov/view/dot/76649.
United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology OST-R Research Roundup Newsletter: June 2024. United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/76649.
Urban transportation systems face challenges in providing connectivity, particularly for the first and last miles of commuters' journeys. Micromobility services, exemplified by e-scooters, have emerged as potential solutions to bridge this gap and enhance the efficiency and accessibility of public transit. As transit ridership demonstrates declinin
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Ewing, R., Kalantari, H. A., & Yang, W. (2024). Increasing Public Transportation Ridership by Integrated Transportation Planning With Micromobility Services in the State of Utah (Report No. UT- 24.10). Utah. Dept. of Transportation. Research Division. https://rosap.ntl.bts.gov/view/dot/77450
Ewing, Reid, Hannaneh A Kalantari, and Wookjae Yang. Increasing Public Transportation Ridership by Integrated Transportation Planning With Micromobility Services in the State of Utah. Report no. UT- 24.10. Utah. Dept. of Transportation. Research Division, 2024. https://rosap.ntl.bts.gov/view/dot/77450.
Ewing, Reid, et al. Increasing Public Transportation Ridership by Integrated Transportation Planning With Micromobility Services in the State of Utah. Utah. Dept. of Transportation. Research Division, 2024, Report no. UT- 24.10, ROSA P. https://rosap.ntl.bts.gov/view/dot/77450.
The objective of this study was to develop practical methods to predict SCB Jc of long term aged (LTA) asphalt mixtures for use in QC/QA programs.
Mohammad, L., & Rupnow, T. (2024). Implementation of Semi-circular Bend (SCB) Test for QC/QA of Asphalt Mixtures [Technical Summary] (Report No. SIO No. DOTLT1000321;LTRC Project No. 19-4B). Louisiana Transportation Research Center. https://rosap.ntl.bts.gov/view/dot/75661
Mohammad, Louay and Tyson Rupnow. Implementation of Semi-circular Bend (SCB) Test for QC/QA of Asphalt Mixtures [Technical Summary]. Report no. SIO No. DOTLT1000321;LTRC Project No. 19-4B. Louisiana Transportation Research Center, 2024. https://rosap.ntl.bts.gov/view/dot/75661.
Mohammad, Louay, and Tyson Rupnow Implementation of Semi-circular Bend (SCB) Test for QC/QA of Asphalt Mixtures [Technical Summary]. Louisiana Transportation Research Center, 2024, Report no. SIO No. DOTLT1000321;LTRC Project No. 19-4B, ROSA P. https://rosap.ntl.bts.gov/view/dot/75661.
The overarching objective of this project is to identify settlement criteria for embankments and retaining walls and develop a systematic soil improvement design tool to facilitate the method selection and construction time and cost estimation. There is a consensus that the post-construction settlement has profound impacts on the service conditions
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Huang, J., Bin-Shafique, S., Wang, F., Figueroa, A., & Sandoval, R. (2024). Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils (Report No. FHWA/TX-25/0-7161-1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/83370
Huang, Jie, Sazzad Bin-Shafique, Fei Wang, Axell Figueroa, and Raul Sandoval. Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils. Report no. FHWA/TX-25/0-7161-1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/83370.
Huang, Jie, et al. Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-25/0-7161-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/83370.
This report evaluates the design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal
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Wiss, Janney, Elstner Associates, Inc. (2024). Design Coefficients of Friction for MoDOT PTFE Bearings [Brief] (Report No. CMR 24-005). Missouri. Department of Transportation. Construction and Materials Division. https://rosap.ntl.bts.gov/view/dot/75403
Wiss, Janney, Elstner Associates, Inc.. Design Coefficients of Friction for MoDOT PTFE Bearings [Brief]. Report no. CMR 24-005. Missouri. Department of Transportation. Construction and Materials Division, 2024. https://rosap.ntl.bts.gov/view/dot/75403.
Wiss, Janney, Elstner Associates, Inc. Design Coefficients of Friction for MoDOT PTFE Bearings [Brief]. Missouri. Department of Transportation. Construction and Materials Division, 2024, Report no. CMR 24-005, ROSA P. https://rosap.ntl.bts.gov/view/dot/75403.
In the proposed third phase of the NJDOT Automated Traffic Signal Performance Measures (ATSPM) project, the research team 1) evaluated Roadside Unit (RSU) /Onboard Unit (OBU) data with ground truth data, 2) validated physical and virtual RSU deployment scenarios for pedestrian safety applications, 3) studied the boundary conditions of Light Detecti
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Jin, P. J., Brennan, J. T. M., Jalayer, M., Ge, Y., Patel, D., Geng, B., Chen, A., & Ahmad, N. S. (2024). Real-Time Traffic Signal System Performance Measurement (Project No. 2016–14) Phase III: System Integration, Intersection Deployment, and Control Center Dashboard Development (Report No. FHWA NJ-2024-005). New Jersey. Department of Transportation. Bureau of Research. https://rosap.ntl.bts.gov/view/dot/84050
Jin, Peter J., Jr. Thomas M. Brennan, Mohammad Jalayer, Yi Ge, Deep Patel, Bowen Geng, Anjiang Chen, and Noshin S Ahmad. Real-Time Traffic Signal System Performance Measurement (Project No. 2016–14) Phase III: System Integration, Intersection Deployment, and Control Center Dashboard Development. Report no. FHWA NJ-2024-005. New Jersey. Department of Transportation. Bureau of Research, 2024. https://rosap.ntl.bts.gov/view/dot/84050.
Jin, Peter J., et al. Real-Time Traffic Signal System Performance Measurement (Project No. 2016–14) Phase III: System Integration, Intersection Deployment, and Control Center Dashboard Development. New Jersey. Department of Transportation. Bureau of Research, 2024, Report no. FHWA NJ-2024-005, ROSA P. https://rosap.ntl.bts.gov/view/dot/84050.
This report summarizes the research work that was completed to: 1) assess the effects of the properties of the aggregates, binders, RAP, and asphalt mixtures on low-temperature cracking resistance of mixes used on local roads, and 2) develop recommendations and specifications for designing low volume pavements that are more resistant to low-tempera
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Nazzal, M. D., Berner, W. (., Abbas, A., & Kim, S. S. (2024). Reducing Low-Temperature Cracking on Local Roads [Fact Sheet]. Ohio. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86691
Nazzal, Munir D, William (Chris) Berner, Ala Abbas, and Sang-Soo Kim. Reducing Low-Temperature Cracking on Local Roads [Fact Sheet]. Ohio. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/86691.
Nazzal, Munir D, et al. Reducing Low-Temperature Cracking on Local Roads [Fact Sheet]. Ohio. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/86691.
In this study, a driving simulator experiment was designed to assess driver distraction caused by roadside projects involving Unmanned Aerial Systems (UASs) and Under-Bridge Inspection Trucks (UBITs). The primary goals were to determine which scenario caused more distraction for drivers under various conditions, such as different UAS sizes, traffic
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Akhavian, R., Machiani, S. G., & Kusha, Z. A. (2024). Caltrans UAS and Driver Safety: Driver Distraction in the Presence of UAS (Report No. CA24-4097). California. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85018
Akhavian, Reza, Sahar Ghanipoor Machiani, and Zainab Afzali Kusha. Caltrans UAS and Driver Safety: Driver Distraction in the Presence of UAS. Report no. CA24-4097. California. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/85018.
Akhavian, Reza, et al. Caltrans UAS and Driver Safety: Driver Distraction in the Presence of UAS. California. Department of Transportation, 2024, Report no. CA24-4097, ROSA P. https://rosap.ntl.bts.gov/view/dot/85018.
The goal of this project was to develop, investigate, and implement optimized concrete mixtures to be used in closure pour connections between precast elements in side-by-side accelerated bridge construction (ABC) superstructure systems. This project involves the use of innovative materials and mixture proportions that are intended to provide high
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Lam, J., Sabers, M., Shah, N., Drimalas, T., Folliard, K. J., Bayrak, O., Wang, H. C. D., & Saqan, E. (2024). Develop Closure Joint Materials Specification and Evaluate Performance for Side-by-Side Accelerated Bridge Construction (ABC) Superstructure Systems (Report No. FHWA/TX-25/0-7088-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/82003
Lam, Justin, Michelle Sabers, Niyam Shah, Thanos Drimalas, Kevin J. Folliard, Oguzhan Bayrak, H C Dennis Wang, and Elias Saqan. Develop Closure Joint Materials Specification and Evaluate Performance for Side-by-Side Accelerated Bridge Construction (ABC) Superstructure Systems. Report no. FHWA/TX-25/0-7088-1. University of Texas at Austin. Center for Transportation Research, 2024. https://rosap.ntl.bts.gov/view/dot/82003.
Lam, Justin, et al. Develop Closure Joint Materials Specification and Evaluate Performance for Side-by-Side Accelerated Bridge Construction (ABC) Superstructure Systems. University of Texas at Austin. Center for Transportation Research, 2024, Report no. FHWA/TX-25/0-7088-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/82003.
New technologies are being added to vehicles at a growing rate to assist drivers and even fully take over the driving task in some situations. These technologies are generally camera-based and typically rely on pavement markings to maintain vehicle position and navigate the roadway. As drivers become more reliant on these systems, and for these sys
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Pike, A., Shirinzad, M., Nayak, A., & Rathinam, S. (2024). Assessing Pavement Markings for Automated Vehicle Readiness (Report No. MN 2024-16). Minnesota. Department of Transportation. Office of Research & Innovation. https://rosap.ntl.bts.gov/view/dot/77435
Pike, Adam, Maryam Shirinzad, Abhishek Nayak, and Sivakumar Rathinam. Assessing Pavement Markings for Automated Vehicle Readiness. Report no. MN 2024-16. Minnesota. Department of Transportation. Office of Research & Innovation, 2024. https://rosap.ntl.bts.gov/view/dot/77435.
Pike, Adam, et al. Assessing Pavement Markings for Automated Vehicle Readiness. Minnesota. Department of Transportation. Office of Research & Innovation, 2024, Report no. MN 2024-16, ROSA P. https://rosap.ntl.bts.gov/view/dot/77435.
State departments of transportation (DOTs) are embracing the use of clean energy and connectivity (CEC) applications along publicly owned right of way (ROW). Applications such as wind and solar power installations, broadband lines, small cell wireless equipment, electric vehicle charging stations, and technologies related to connected and automated
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Thompson, T., Moses, D., Wallace, C., Clay-Young, P., & Sandlin, A. (2024). Accommodating Innovative Uses of Public Right of Way (Report No. KTC-24-32). University of Kentucky Transportation Center. https://doi.org/10.13023/ktc.rr.2024.32
Thompson, Travis, David Moses, Candice Wallace, Pam Clay-Young, and Arlen Sandlin. Accommodating Innovative Uses of Public Right of Way. Report no. KTC-24-32. University of Kentucky Transportation Center, 2024. https://doi.org/10.13023/ktc.rr.2024.32.
Thompson, Travis, et al. Accommodating Innovative Uses of Public Right of Way. University of Kentucky Transportation Center, 2024, Report no. KTC-24-32, ROSA P. https://doi.org/10.13023/ktc.rr.2024.32.
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