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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 81 - 100 of 36569 results
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • 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 ...
  • Development of a Pavement Friction Management Program
    Development of a Pavement Friction Management Program
    Hu, Run ;
    Maia, Renan Santos
    2026-05-01 | PDF
    This project aims to develop a comprehensive framework for statewide pavement friction management and safety-oriented decision-making for IDOT. The project was structured into several key tasks. First, a literature review was conducted to synthesize existing research on pavement friction measurement, friction-crash relationships, investigatory leve ...
  • 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 ...
  • 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 ...
  • Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Green, Kelly ;
    Finley, Kari
    2026-05-01 | PDF
    This project supported the Traffic Safety Culture Transportation Pooled Fund (TSC-TPF) by developing outreach materials and a communication plan to improve the dissemination and use of research findings. Using the Improving Pedestrian Safety project as a pilot, the project team created a concise project summary, audience-specific speaking points, a ...
  • Report 26R43 Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance Research Project Brief
    Report 26-R43: Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance [Research Project Brief]
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-05-01 | PDF
    Research Objectives: • Characterize the asphalt binder availability, activity, and contribution from RAP materials and corresponding asphalt mixtures. • Evaluate the effectiveness of recycling agents (RAs) for improved blending with virgin binder. • Assess the effect of RBA and RAs on asphalt mixtures volumetrics and performance.
  • 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 ...
  • 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 from the study, presented in this document, can guide TxDOT engineers about whether seal coat should be placed ov ...
  • Investigation of Unbraced Pile Height in Fully Encased Pile Bents of Bridge Structures
    Investigation of Unbraced Pile Height in Fully Encased Pile Bents of Bridge Structures
    Dahlberg, Justin ;
    Liu, Zhengyu
    2026-05-01 | PDF
    This study investigated the structural performance of fully encased steel H-piles used in bridge foundations, with a specific focus on the effects of unbraced pile height resulting from scour conditions. While concrete encasement is widely used to protect piles, its structural contribution is often excluded from axial capacity calculations in curre ...
  • Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles
    Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles
    Inoue, Danilo ;
    Glover, Brianne
    2026-05-01 | PDF
    Overweight (OW) vehicles contribute to pavement and bridge deterioration, creating additional maintenance needs that may exceed the revenues generated through existing permit fees. This study developed a methodology for periodically updating Texas OW permit fees to reflect evolving traffic patterns, vehicle configurations, and infrastructure costs. ...
  • Solution to Interfacial Delamination of NMDOTs Asphalt Pavements
    Solution to Interfacial Delamination of NMDOT's Asphalt Pavements
    Alam, Muhammad Tasnim ;
    Tarefder, Rafi
    2026-05-01 | PDF
    This study investigated interfacial delamination in NMDOT's asphalt pavements and developed improved methods for evaluating and improving bonding between asphalt layers. Laboratory testing evaluated four tack coat types: trackless tack, SS-1H, SS-1HP, and CSS-1H. Direct shear tests were used to measure interface shear strength under different tack ...
  • Seismic Avalanche Detection for the Turnagain Arm Transportation Corridor
    Seismic Avalanche Detection for the Turnagain Arm Transportation Corridor
    Lynch, Richard
    2026-05-01 | PDF
    Three inexpensive ultra-low-noise MEMS accelerometers were deployed along the Turnagain Arm corridor near Girdwood, Alaska, to evaluate automated seismic avalanche detection. Over 145 days of monitoring, 400 seismic events were recorded including two confirmed avalanches on the same evening (one detected seismically, one confirmed by sensor burial) ...
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