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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 1 - 20 of 36368 results
  • Parking Requirements Drive Up Housing Costs Issue Brief
    Parking Requirements Drive Up Housing Costs [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    This issue brief synthesizes research that clearly demonstrates how minimum parking requirements exacerbate the housing affordability crisis. Parking requirements are zoning rules that require new homes to include a minimum number of off-street parking spaces, regardless of site-specific conditions, costs, or residents’ needs. Parking is expensive ...
  • Minimum Parking Requirements Fuel Driving Issue Brief
    Minimum Parking Requirements Fuel Driving [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    High levels of driving can impose significant social costs, including traffic injuries and deaths, congestion, air and noise pollution, and health risks linked to sedentary lifestyles. Minimum parking requirements amplify these impacts by encouraging car ownership and driving — and discouraging other ways of moving around. These mandates typically ...
  • What Happens When Cities Eliminate Minimum Parking Requirements Issue Brief
    What Happens When Cities Eliminate Minimum Parking Requirements? [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    Despite growing evidence that minimum parking requirements both constrain development and produce more parking than necessary or desirable, many cities remain reluctant to repeal them. A common concern is that eliminating these mandates will result in too little off-street parking. This issue brief synthesizes research from cities that have already ...
  • Michigan One Point Cone Test for Evaluating the Density of OpenGraded Drainage Course OGDC Materials
    Michigan (One Point) Cone Test for Evaluating the Density of Open-Graded Drainage Course (OGDC) Materials
    Congress, Surya S. C. ;
    Cetin, Bora
    2026-05-15 | PDF
    Pavement infrastructure is a significant public investment (over $60 billion annually in the U.S.), yet 39% of major roads are in poor condition, resulting in costly repairs and user expenses. Maximizing pavement longevity is critical to address a projected $684 billion funding gap in road maintenance, and improving compaction quality in pavement b ...
  • Business Impacts of Access Changes
    Business Impacts of Access Changes
    Gillespie, James S. ;
    Batman, Isaiah E.
    2026-05-01 | PDF
    Some types of geometric improvements that the Virginia Department of Transportation (VDOT) has begun to build in the past two decades, such as the reduction in the number of arterial access points, the replacement of a traditional four-way intersection with a roundabout, or a restricted crossing U-turn, or left-turn prohibitions, have elicited expr ...
  • The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads
    The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    Transportation construction activities involving in-stream work can mobilize sediment and elevate turbidity, which can affect sensitive aquatic species such as freshwater mussels. Although cofferdams are used to isolate construction areas and limit sediment mobilization, their installation and removal create some degree of sediment release as a res ...
  • Report 26R39 The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads Research Project Brief
    Report 26-R39: The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads [Research Project Brief]
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    This study aimed to determine the transport distances of sediment associated with the installation and removal of cofferdams. Related objectives were to (1) compare the impact of cofferdam-related construction events on sediment loads and (2) to document factors that affect recovery times and sediment loads.
  • Automated Methods for Correcting ODOTs RealTime GNSS Network for Survey and PostDisaster Recovery
    Automated Methods for Correcting ODOT’s Real-Time GNSS Network for Survey and Post-Disaster Recovery
    Simpson, Chase ;
    Ohene, William
    2026-05-01 | PDF
    The Oregon Real-Time GNSS Network (ORGN), managed by the Oregon Department of Transportation, serves as a critical backbone for high-precision positioning services across the state. However, the absence of a streamlined workflow for aligning ORGN station coordinates to the National Spatial Reference System (NSRS) has introduced challenges in consis ...
    Supporting Files
  • Expanding Adaptive Traffic Control Signal Systems A Strategic Study for Louisianas Arterial Highways Project Capsule
    Expanding Adaptive Traffic Control Signal Systems: A Strategic Study for Louisiana’s Arterial Highways [Project Capsule]
    Chauvin, Clark
    2026-05-01 | PDF
    The objective of this research project is to develop a guide for expanding, implementing, maintaining, and evaluating Adaptive Traffic Control Systems (ATCS)in Louisiana. The guide will be grounded in data driven evaluation of existing Louisiana deployments and national best practices, with a focus on practical implementation under DOTD standards a ...
  • ShortTerm Field Evaluation of SprayOn Rejuvenators for Asphalt Pavement Preservation
    Short-Term Field Evaluation of Spray-On Rejuvenators for Asphalt Pavement Preservation
    Boz, Ilker ;
    Turochy, Elizabeth
    2026-05-01 | PDF
    Spray-on rejuvenators are pavement preservation treatments intended to mitigate oxidative aging of asphalt binder in the near-surface region of asphalt pavements. Although several highway agencies have evaluated these treatments, reported performance outcomes vary, and the Virginia Department of Transportation (VDOT) has limited documented experien ...
  • Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements
    Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    In 2020, the Virginia General Assembly enacted the Virginia Wildlife Corridor Action Plan (WCAP; Code of Virginia § 29.1579), which directed the Virginia Department of Transportation (VDOT) and other state agencies to identify wildlife corridors and areas with a high risk of wildlife-vehicle collisions to prioritize wildlife crossing projects that ...
  • Report 26R41 Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements Research Project Brief
    Report 26-R41: Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements [Research Project Brief]
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    The purpose of this study was to develop a predictive model to identify road segments in Virginia at high risk of white-tailed deer- or black bear-vehicle collisions. A related objective was to develop a benefit-cost methodology that complements the predictive model and supports consistent and defensible benefit-cost analyses for large animal-vehic ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol II Evaluation of Skewed Steel IGirder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. II): Evaluation of Skewed Steel I-Girder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-05-01 | PDF
    Two skewed (around 45°) two-span continuous bridges with stub abutments or integral abutments were monitored in the field during construction and after the bridges were in service. The goal was to establish a comprehensive understanding of load distribution in skewed steel I-girder bridges and to potentially refine their analysis and design procedu ...
  • Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events Phase II
    Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events: Phase II
    Salahat, Fahed H. ;
    Jones, Christopher A.
    2026-05-01 | PDF
    Reinforced concrete (RC) barriers are often used as railings to protect bridge piers against vehicular collision force (VCF). RC barriers absorb collision energy and/or redirect vehicles. According to bridge design specifications of the American Association of State Highway and Transportation Officials (AASHTO), barriers used to protect bridge pier ...
  • Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life Technical Summary
    Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life [Technical Summary]
    Al Shboul, Khalid W. ;
    Rasheed, Hayder A.
    2026-05-01 | PDF
    Low-cost cantilevered and butterfly sign support structures are commonly used because they more effectively reduce the probability of vehicle collision compared to overhead sign structures. Over time, the span of cantilevered support structures has increased as safety concerns have caused the upright component of the structures to be installed furt ...
  • Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events Phase II Technical Summary
    Computationally Informed Methodologies for Capturing the Effect of Intervening Structures During Truck Impact Events: Phase II [Technical Summary]
    Salahat, Fahed H. ;
    Jones, Christopher A.
    2026-05-01 | PDF
    The primary objective of this research was to assess the performance of sub-standard RC barriers as protection for bridge piers against VCF and quantify their reduction of the equivalent static force (ESF) that piers must resist according to AASHTO specifications. This report describes current procedures to determine the transverse static capacity ...
  • Operational and Capital Cost Management at Rural and Small Urban Transit Systems
    Operational and Capital Cost Management at Rural and Small Urban Transit Systems
    Walk, Michael J. ;
    Etminani-Ghasrodashti, Roya
    2026-05-01 | PDF
    One of the goals of the public transit system is to provide a high-quality and affordable service while ensuring the system remains cost-efficient. Since the COVID-19 pandemic, public transit systems have experienced substantial changes in passenger ridership, revenue streams, operational costs, and capital costs. In Texas and other regions, rural ...
  • Seal Coat and Rumble Strip Guidelines Predicting Rumble Strip Noise Performance
    Seal Coat and Rumble Strip Guidelines: Predicting Rumble Strip Noise Performance
    Texas Department of Transportation. Research and Technology Implementation Office  ...
    2026-05-01 | PDF
    In TxDOT research project 0-7029, the research team at the Texas A&M Transportation Institute investigated the impact of sequential seal coats, seal coat grade type, and other factors on rumble strip performance. The key recommendations form of the study, presented in this document, can guide TxDOT engineers about whether seal coat should be placed ...
  • Upgrade and Performance Testing of the Benchmark Profiler and the Urban and LowSpeed Profiler
    Upgrade and Performance Testing of the Benchmark Profiler and the Urban and Low-Speed Profiler
    Karamihas, Steven M. ;
    Gilbert, Mark E.
    2026-05-01 | PDF
    This report describes upgrades to the Federal Highway Administration Benchmark Profiler (BP) and the University of Michigan Transportation Research Institute Urban and Low-Speed Profiler (ULSP) and comparison between profiles measured by the two devices. BP and ULSP measurements were compared on six pavement sections at the Illinois Certification a ...
  • Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Wang, Liming ;
    Gregor, Brian
    2026-05-01 | PDF
    This project upgraded the land use module for the VisionEval framework to enhance the evaluation of integrated transportation and land use policies and their impacts. The project developed a new strategic land use model utilizing NHTS and Smart Location Database data from 2011 and 2019, applying advanced statistical and machine learning methods to ...
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