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rosaP Repository & Open Science Access Portal

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 521 - 540 of 36368 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 2025 DMV Customer Satisfaction Survey
    2025 DMV Customer Satisfaction Survey
    May, Matthew ;
    McGinnis-Brown, Lantz
    2025-05-20 | PDF
    The Idaho Transportation Department’s Division of Motor Vehicles underwent major system modernization efforts over the past decade, including expansion of online service delivery and improvements to its DMV web portal. Boise State University’s Idaho Policy Institute assesses whether system changes are meeting customer needs and expectations to bett ...
  • Reducing the Dependency on Chlorides and Impacts
    Reducing the Dependency on Chlorides and Impacts
    John, Ajuna P. ;
    Shin, Hoon C.
    2025-05-20 | PDF
    This study examined the performance and environmental impacts of various deicing materials, assessed their short-and long-term effects on infrastructure, soil, and water quality, and identified opportunities for operational improvement within INDOT’s winter maintenance practices. The study used a comprehensive methodology that included an extensive ...
  • Feasibility of Utilizing Native Grasses and Forbs in Lieu of Exotic Cool Season Grasses on Roadside RightsofWay
    Feasibility of Utilizing Native Grasses and Forbs in Lieu of Exotic Cool Season Grasses on Roadside Rights-of-Way
    Bollinger, Wesley ;
    Bhattarai, Rabin
    2025-05-15 | PDF
    We assessed the status of 34 native species plantings along roadsides in Indiana and Illinois and evaluated soil conditions, distance from road, and surrounding landscape cover to determine which factors led to successful long-term establishment of plantings. Cover by seeded native species and native species overall increased with distance from roa ...
  • Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing Material Characterization and Design
    Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing – Material Characterization and Design
    Nanni, Antonio ;
    De Caso, Francisco
    2025-05-13 | PDF
    The durability of coastal bridge structures is significantly impacted by the corrosion of steel reinforcement, particularly in waterline pile cap footings exposed to aggressive marine environments. This study investigates the feasibility of using large-diameter glass fiber-reinforced polymer (GFRP) bars as a corrosion-resistant alternative to tradi ...
  • Caltrans Traffic Operations Data Standards Implementation Recommendations
    Caltrans Traffic Operations Data Standards Implementation Recommendations
    Patire, Anthony D.
    2025-05-13 | PDF
    This report investigates the evolving landscape of data standards within the transportation ecosystem, emphasizing their critical role in enabling interoperability, safety, and innovation across Intelligent Transportation Systems (ITS). The report outlines a strategic approach for advancing transportation data interoperability, emphasizing the need ...
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