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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.

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Showing 741 - 760 of 36841 results
  • Development of a Standard Practice for the Design of Durable OpenGraded Friction Course OGFC Mixtures with Epoxy Asphalt
    Development of a Standard Practice for the Design of Durable Open-Graded Friction Course (OGFC) Mixtures with Epoxy Asphalt
    Mohammad, Louay N. ;
    Abualia, Anas
    2025-06-01 | PDF
    Open-graded friction course (OGFC) is a thin asphalt mixture surface layer. It is gap-graded with a high percentage of coarse aggregates that are nearly uniform in size, resulting in a high percentage of interconnected air voids and asphalt binder, which provides improved skid resistance, visibility, and decreased pavement-tire noise. However, cons ...
  • Rural Public Transportation and Maine Review of State Best Practices Technical Report
    Rural Public Transportation and Maine: Review of State Best Practices Technical Report
    Rubin, Jonathan ;
    Evans-Ralston, Connor
    2025-06-01 | PDF
    MaineDOT has a family of transit plans that have been developed over the past five years through collaborative efforts with partners and stakeholders. These plans share similar themes, guidance, and recommendations and tie into the Department’s Long-Range Transportation Plan, which was completed in 2023. This report complements those plans, reviewi ...
  • Identifying the Critical GoldenHour Zones in Rural Kansas Summary
    Identifying the Critical Golden-Hour Zones in Rural Kansas [Summary]
    Kommineni, Namratha ;
    Aziz, H.M. Abdul
    2025-06-01 | PDF
    This study developed a data-driven geospatial tool to optimize emergency response strategies for vehicle crashes in Kansas. The tool analyzed more than a decade of crash data from the Kansas Department of Transportation (KDOT) and the Fatality Analysis Reporting System (FARS) to provide insight into T1 (crash to emergency medical services [EMS] not ...
  • Evaluation of Performance of Coal Ash in Florida Structural Concrete
    Evaluation of Performance of Coal Ash in Florida Structural Concrete
    Zayed, Abla ;
    Riding, Kyle
    2025-06-01 | PDF
    Recent coal-fired power plant closures resulted in limited availability of fresh fly ash in some regions of the United States of America. This combined with stricter environmental regulations has led to national specifications being modified to allow the use of coal bottom ash in addition to coal fly ash as a supplementary cementitious material in ...
  • Prediction of Safety Opportunities Using Automated Traffic Signal Performance Measures
    Prediction of Safety Opportunities Using Automated Traffic Signal Performance Measures
    Abdel-Aty, Mohamed A. ;
    Islam, Zubayer
    2025-06-01 | PDF
    This report presents the Smart Signal Performance Monitor (SSPM) system, developed to enhance intersection safety in Florida. The SSPM utilizes Automated Traffic Signal Performance Measures (ATSPM) to provide data-driven signalization recommendations. Raw ATSPM data is transformed into performance measures like Signal Phasing and Timing (SPaT) metr ...
  • Aligning Iowa Driver Education Curriculum and Standards Toward a Zero Fatalities Vision
    Aligning Iowa Driver Education Curriculum and Standards Toward a Zero Fatalities Vision
    Hallmark, Shauna ;
    Veneziano, David
    2025-06-01 | PDF
    Although young drivers log fewer miles than any age group except the elderly, the number of crashes and fatalities they experience is disproportionately high. Driver education is an important part of helping young drivers learn the basic skills of driving, but current requirements for driver education in Iowa do not take a comprehensive or data-dri ...
  • Evaluation of Feasibility of Deployment of Runaway Truck Detection and Warning Systems at Truck Escape Ramps
    Evaluation of Feasibility of Deployment of Runaway Truck Detection and Warning Systems at Truck Escape Ramps
    McCarthy, Gillian ;
    Kononov, Jake
    2025-06-01 | PDF
    Despite the presence of properly signed and well-located runaway truck ramps, crashes involving trucks with overheated or otherwise failed brakes continue to occur downhill from the ramp locations. A recently deployed experimental truck warning system on Wolf Creek Pass on westbound SH160 shows some promise of effective crash reduction. The intent ...
  • Identifying the Critical GoldenHour Zones in Rural Kansas
    Identifying the Critical Golden-Hour Zones in Rural Kansas
    Kommineni, Namratha ;
    Aziz, H.M. Abdul
    2025-06-01 | PDF
    This study developed a data-driven geospatial tool to optimize emergency response strategies for vehicle crashes in Kansas. The tool analyzed more than a decade of crash data from the Kansas Department of Transportation (KDOT) and the Fatality Analysis Reporting System (FARS) to provide insight into T1 (crash to emergency medical services [EMS] not ...
  • Howling of a ModelScale Nozzle Due to ShockInduced BoundaryLayer Separation at Its Exit
    Howling of a Model-Scale Nozzle Due to Shock-Induced Boundary-Layer Separation at Its Exit
    Ramsey, David N. ;
    Gavin, Joseph R.
    2025-06-01 | PDF
    The jet from a model-scale, internally mixed nozzle produced a loud howling when operated at jet Mach numbers between 0.80 and 1.00. Discrete tones dominated the noise radiated to the far field and powerful oscillations were present in the jet. To explain these observations, this paper leverages a blend of experimental acoustic and flow measurement ...
  • Seat Belt Use in North Dakota 2025
    Seat Belt Use in North Dakota, 2025
    Andersen, Jaclyn ;
    Vachal, Kimberly
    2025-06-01 | PDF
    The objective of this study was to estimate the statewide rate of seat belt use of drivers and right front-seat passengers in North Dakota. Additional analyses estimated seat belt use rates in the following categories: •Occupant position (driver, passenger) •Gender (male, female) •Type of vehicle (car, van, sport utility vehicle, truck) •Region of ...
  • StrutandTie Method for Reinforced Concrete Members With Cold Joints
    Strut-and-Tie Method for Reinforced Concrete Members With Cold Joints
    Li, Brandon ;
    Sanchez, Andrea Campos
    2025-06-01 | PDF
    Cold joints are a frequent and often unavoidable occurrence in reinforced concrete construction; however, current design provisions offer limited guidance for assessing their effect on load transfer and failure mechanisms, particularly when cold joints intersect critical load paths in disturbed regions. This research proposes a mechanically-based a ...
    Supporting Files
  • Standardization of SIP Calculation for Hamburg Wheel Tracking Test
    Standardization of SIP Calculation for Hamburg Wheel Tracking Test
    Yin, Fan ;
    Chen, Chen
    2025-06-01 | PDF
    This project aimed to develop software to standardize and automate the calculation of stripping inflection point (SIP) from the Hamburg Wheel Tracking Test (HWTT) for evaluating the moisture susceptibility of asphalt mixtures. A survey of state highway agencies (SHAs) was conducted to collect information on their use of HWTT to evaluate asphalt mix ...
  • Developing Tools to Mitigate the Impact of Design Errors and Omissions
    Developing Tools to Mitigate the Impact of Design Errors and Omissions
    Jayana, Nilima ;
    Abdelaty, Ahmed
    2025-06-01 | PDF
    The main objectives of this research are to quantify the impact of design errors and omissions (E&Os) in Wyoming Department of Transportation (WYDOT) highway construction projects, identify their causes, propose mitigation strategies, develop tools to minimize the adverse effects of E&Os, and create plans and procedures for effective management. Th ...
  • Investigation of Poor Compressive Strength and Performance of A45 Structural Concrete Mixes
    Investigation of Poor Compressive Strength and Performance of A45 Structural Concrete Mixes
    Rotherham, Jill ;
    Shearer, Christopher R.
    2025-06-01 | PDF
    In the five years leading up to the 2022 construction season, the South Dakota Department of Transportation (SDDOT) observed an increasing failure rate for their A45 structural concrete mixes, with mixes failing to meet the 4500psi compressive strength requirement. The sources of low compressive strength concrete tests identified by SDDOT were inve ...
  • 5GEnabled Safe and Robust Deep MultiAgent Reinforcement Learning Framework for CAV Coordination
    5G-Enabled Safe and Robust Deep Multi-Agent Reinforcement Learning Framework for CAV Coordination
    Miao, Fei ;
    Han, Song
    2025-06-01 | PDF
    We address the problem of coordination and control of Connected and Automated Vehicles (CAVs) in the presence of imperfect observations in mixed traffic environment. A commonly used approach is learning-based decision-making, such as reinforcement learning (RL). However, most existing safe RL methods suffer from two limitations: (i) they assume acc ...
    Supporting Files
  • Effectiveness Monitoring of CTDOT Conservation Areas Pollinator Habitat Survey
    Effectiveness Monitoring of CTDOT Conservation Areas: Pollinator Habitat Survey
    Legrand, Ana
    2025-05-31 | PDF
    A pollinator habitat survey project was conducted in 2023 and 2024 to determine the effectiveness of CTDOT reduced mowing and late season mowing practices in designated conservation areas. The project evaluated the presence of milkweed resources for monarch butterflies and of nectar resources for pollinators in general. The Candidate Conservation A ...
  • Study the Impacts of Caltrans Thermoplastic Stripe Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Study the Impacts of Caltrans Thermoplastic Stripe, Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Asvapathanagul, Pitiporn ;
    Gedalanga, Philip
    2025-05-31 | PDF
    Microplastic (MP) pollution has emerged as a critical environmental concern due to its pervasive presence and harmful impacts on human and environmental health. MPs, defined as plastic particles ranging from 1 nm to 5 mm, are problematic because of their ability to disperse widely across ecological habitats. Recent studies have illuminated roadways ...
  • Nebraska Balanced Mix Design Phase II
    Nebraska Balanced Mix Design – Phase II
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2025-05-31 | PDF
    This study aimed to propose a performance-based framework to evaluate highly recycled asphalt mixtures containing polymer-modified binders for potential use in a balanced mix design (BMD) specification in the state of Nebraska. For that, loose and compacted mixtures were directly collected from plant and field projects within a benchmarking study, ...
  • California Partners for Advanced Transportation Technology PATH Research Program Management
    California Partners for Advanced Transportation Technology (PATH) Research Program Management
    Fishelson, James ;
    Moura, Scott
    2025-05-29 | PDF
    California Partners for Advanced Transportation Technology (PATH) was founded in 1986, as a partnership between the California Department of Transportation (Caltrans) and the University of California. PATH is a statewide research program in Intelligent Transportation Systems (ITS) focusing on improving safety, system performance, accessibility, and ...
  • Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Sisi, Saeid Delshad ;
    Linke, Barbara
    2025-05-20 | PDF
    The California Department of Transportation (Caltrans) owns many medium-to-large equipment yards and maintenance stations. Vehicles are often stored in these fenced and secure yards. However, Caltrans still experiences vehicle component theft from these yards. In recent years, there has been a significant increase in theft at Caltrans facilities. T ...
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