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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 401 - 420 of 36054 results
  • Pedestrian Safety and Traffic Operations Near Transit Stops 2025
    Pedestrian Safety and Traffic Operations Near Transit Stops [2025]
    Singleton, Patrick A. ;
    Paskett, Aleks
    2025-06-01 | PDF
    This research project’s objective was to investigate the impacts of transit stop location (near-side versus far-side) on pedestrian safety and traffic operations at intersections. Three different video-based behavioral observation data collections at signals in Utah were utilized and studied: (1) transit stop events (interactions between transit ve ...
  • Assessing SpeedingRelated Crashes in Louisiana to Support to Safe System Approach Brief
    Assessing Speeding-Related Crashes in Louisiana to Support to Safe System Approach [Brief]
    Moomen, Milhan ;
    Rupnow, Tyson
    2025-06-01 | PDF
    The role of vehicle operating speed in traffic crashes is a complex issue, as speeding-related crashes continue to pose significant challenges. Speed greatly impacts both the frequency of crashes and the severity of the resulting injuries. Additionally, excessive speed raises the likelihood of losing control during evasive maneuvers and amplifies c ...
  • Groundwater Flooding on Highways in the Nebraska Sandhills Applying Remote Sensing Precipitation and Groundwater Modeling to Determine Depth Cause and Frequency
    Groundwater Flooding on Highways in the Nebraska Sandhills: Applying Remote Sensing, Precipitation and Groundwater Modeling to Determine Depth, Cause and Frequency
    Mittelstet, Aaron
    2025-06-01 | PDF
    Climate change significantly impacts infrastructure sustainability, particularly through shifts in precipitation patterns, intensity, and duration. These precipitation dynamics may increase the occurrence of surface water and groundwater flooding. Groundwater in the Nebraska Sand Hills (NSH), including the thickest portions of the High Plains Aquif ...
  • Concept of Operations Active Transportation and Travel Information System
    Concept of Operations: Active Transportation and Travel Information System
    AECOM
    2025-06-01 | PDF
    The Minnesota Department of Transportation (MnDOT)’s 511 Traveler Information System. It describes a concept to improve the provision of traveler information to active transportation users. The concept advocates for the inclusion of traveler information for all transportation modes, emphasizing the needs of active transportation users, including cy ...
  • Shear Wave Velocity Measurements Research Summary
    Shear Wave Velocity Measurements [Research Summary]
    Torgashov, Evgeniy V.
    2025-06-01 | PDF
    The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit ...
  • Taconite as a LowerCost Alternative High Friction Surface Treatment to Calcined Bauxite for Low Volume Roads in Minnesota
    Taconite as a Lower-Cost, Alternative High Friction Surface Treatment to Calcined Bauxite for Low Volume Roads in Minnesota
    Zanko, Lawrence M. ;
    Marasteanu, Mihai O.
    2025-06-01 | PDF
    Minnesota’s taconite (iron ore) mining industry can provide adequate or comparable skid resistance performance to calcined bauxite in high friction surface treatment (HFST)-type applications. Six pavement test sections approximately 1/10th of a mile (160 meters) in length were established at a low volume road location northwest of Duluth, Minnesota ...
  • Evaluating the Friction of Pavement Markings and Colored Pavement Research Summary
    Evaluating the Friction of Pavement Markings and Colored Pavement [Research Summary]
    Marasteanu, Mihai O. ;
    Peterson, Ethan
    2025-06-01 | PDF
    This Research Summary is part of the final deliverable for Report 2025-30, "Pavement Marking/Colored Pavement Friction Differential and Product Durability."
  • A New Generation of Porous Asphalt Pavement OGFC Support Study Technical Summary
    A New Generation of Porous Asphalt Pavement: OGFC Support Study [Technical Summary]
    Elseifi, Mostafa A.
    2025-06-01 | PDF
    The objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Lou ...
  • A New Generation of Porous Asphalt Pavement OGFC Support Study
    A New Generation of Porous Asphalt Pavement – OGFC Support Study
    Elseifi, Mostafa A. ;
    Abohamer, Hossam
    2025-06-01 | PDF
    The objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Lou ...
  • Evaluation of A Truck InCab Alert System
    Evaluation of A Truck In-Cab Alert System
    Goodall, Noah J. ;
    Lan, Chien-Lun
    2025-06-01 | PDF
    Transportation agencies have long communicated directly with truck drivers regarding weigh station compliance and parking availability, sometimes making use of applications provided by private third-party partners. One of these applications has expanded capabilities that allow agencies to transmit safety alerts directly to drivers through the in-ca ...
  • Behavior of the Expanded Polystyrene Elastic Inclusion at Integral Abutments
    Behavior of the Expanded Polystyrene Elastic Inclusion at Integral Abutments
    Tanyu, Burak F ;
    Guler, F Erol
    2025-06-01 | PDF
    This report presents the findings of a laboratory study conducted by the Sustainable Geotransportation/Geoenvironmental Infrastructure (SGI) Research Group at George Mason University. The research focused on investigating the ability of standard (S) and elasticized (E) expanded polystyrene (EPS) to provide elastic inclusion in integral abutments. E ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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