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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 121 - 140 of 35440 results
  • North Dakota Statewide Traffic Safety Survey 2025 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2025: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2025-08-01 | PDF
    The statewide driver traffic safety survey provides baseline and longitudinal metrics for the Highway Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In additi ...
  • Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Mohammad, Louay N. ;
    Elnaml, Ibrahim
    2025-08-01 | PDF
    The use of reclaimed asphalt pavement (RAP) as a partial replacement for virgin aggregates and asphalt binders has received considerable attention in recent years due to its economic and environmental benefits. These benefits include a potential reduction in asphalt mixture cost and the promotion of sustainability. However, many state Departments o ...
  • Measuring Access to Improve Public Health Phase II
    Measuring Access to Improve Public Health – Phase II
    Gonzales, Eric J. ;
    Christofa, Eleni
    2025-08-01 | PDF
    This study advances transportation access metrics that support public health planning across Massachusetts. Building on Phase I, which focused on food access, Phase II expands the scope to include healthcare, higher education, and parks. The research improves methods to account for walkability, bikeability, and the role of microtransit alongside fi ...
  • Generation2 Fragility Models for California Highway Bridges
    Generation-2 Fragility Models for California Highway Bridges
    Zheng, Qiu ;
    Yang, Walter C.S.
    2025-08-01 | PDF
    This report provides a summary of the framework and methodology underlying the second-generation seismic fragility work (g2F) using selected concrete box-girder bridges in California. It outlines the key components and processes involved in the g2F project designed to improve earthquake risk assessment and mitigation strategies. The report first in ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2024 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2024 Activities
    Finley, Melisa D. ;
    Brewer, Marcus A.
    2025-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
  • Modeling the Dynamic Modulus of Asphalt Mixtures Using SingleValue Test Results Phase III Development of LowTemperature HighFrequency Relations
    Modeling the Dynamic Modulus of Asphalt Mixtures Using Single-Value Test Results, Phase III: Development of Low-Temperature, High-Frequency Relations
    Fieldkircher, Beatriz ;
    Adejube, Jeremiah
    2025-08-01 | PDF
    This research developed a practical method to relate UDOT’s existing material tests for asphalt mixtures, including the Bending Beam Rheometer (BBR) for low-temperature behavior and the IDEAL-CT for intermediate-temperature cracking, to the dynamic modulus (E*) master curve required for Level 1 inputs in AASHTOWare Pavement ME®. The proposed approa ...
  • A Comparison of Service Life Models for Concrete Corrosion Durability Summary
    A Comparison of Service Life Models for Concrete Corrosion Durability [Summary]
    Antunes, Rodrigo ;
    Alhasan, Ahmad
    2025-08-01 | PDF
    The objective of this project was to evaluate and compare different models used to predict the service life of concrete structures under the risk of chloride-induced corrosion and identify the most suitable model for FDOT. The project also sought to recommend appropriate input parameters for the selected model, considering Florida’s unique environm ...
  • Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications
    Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications
    Morsy, Amr M ;
    Zornberg, Jorge G.
    2025-08-01 | PDF
    This research investigated the use of lightweight fills as an alternative to conventional fills in transportation infrastructure, particularly for fill applications on soft, compressible soils. The study synthesized current practices through a literature review, survey of state DOTs, evaluation of case studies, and material costs. Through this rese ...
  • Development of Tennessee UHPC for Bridge Applications
    Development of Tennessee UHPC for Bridge Applications
    Mohr, Benjamin J ;
    Maleque, Md Saeid Ebna
    2025-07-31 | PDF
    Ultra-high performance concrete (UHPC) is known for its exceptionally high mechanical properties and enhanced durability performance. In Accelerated Bridge Construction (ABC), UHPC can be used for precast structural members as well as for bridge repairs, retrofitting and overlay construction. Densely compacted UHPC has a compressive strength of mor ...
  • Guidelines for Implementing Carbon Capture Utilization and Storage CCUS Technologies on TxDOT Projects
    Guidelines for Implementing Carbon Capture, Utilization and Storage (CCUS) Technologies on TxDOT Projects
    Schwerdt, Tom ;
    Rausch, Christopher
    2025-07-31 | PDF
    This report provides guidance to the Texas Department of Transportation (TxDOT) on the potential implementation of Carbon Capture, Utilization, and Storage (CCUS) technologies in transportation infrastructure projects. It synthesizes recent developments in CCUS funding, policy, and technical applications, with the understanding that many of these d ...
  • Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Kay, Jonathan J. ;
    Gates, Timothy J.
    2025-07-25 | PDF
    Despite the fact that highway work zones represent a required element of maintaining and improving the transportation network, the resulting changes in traffic patterns, narrowed right-of-way, and other construction activities can lead to an increased risk for traffic crashes and related injuries or fatalities. This research sought to identify the ...
  • Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Diefenderfer, Brian K ;
    Nair, Harikrishnan
    2025-07-01 | PDF
    During asphalt pavement construction, obtaining adequate and uniform density throughout the pavement layer through the compaction process is critical to achieving the desired performance. Optimum pavement density reduces oxidation potential and moisture damage, decreases rutting potential, and improves fatigue life. Numerous national research proje ...
  • Pavement Preservation Demonstration Projects for Chip Seal and Microsurfacing Treatments
    Pavement Preservation Demonstration Projects for Chip Seal and Microsurfacing Treatments
    Boz, Ilker ;
    Nair, Harikrishnan
    2025-07-01 | PDF
    In 2021, the Virginia Department of Transportation (VDOT) collaborated with the National Cooperative Highway Research Program (NCHRP 20-44(26)) project research team to develop three specifications for chip seals, microsurfacing, and fog seals, incorporating recommendations from guidelines developed under the NCHRP 14-37 project and American Associ ...
  • A Management Plan for Historic Bridges in Virginia The 2024 Update
    A Management Plan for Historic Bridges in Virginia: The 2024 Update
    Miller, Ann B.
    2025-07-01 | PDF
    A Management Plan for Historic Bridges in Virginia, published in 2001, identified the management and treatment needs for historic bridges in Virginia (i.e., bridges individually eligible for or listed on the National Register of Historic Places) that were under some measure of state purview. Updates to the plan at 5-year intervals are now required ...
  • Winter Severity Index with Winter Maintenance Expenses and Material Usage
    Winter Severity Index with Winter Maintenance Expenses and Material Usage
    Zockaie, Ali ;
    Fadaei, Ardeshir
    2025-07-01 | PDF
    Effective winter road maintenance is crucial for safe travel and represents a substantial portion of the Michigan Department of Transportation’s (MDOT) annual budget. A primary challenge in winter operations is resource allocation for different winter maintenance materials, due to the substantial variability in winter weather conditions across Mich ...
  • Estimating HCM Default Parameters for Louisiana Summary
    Estimating HCM Default Parameters for Louisiana [Summary]
    Rahman, M. Ashifur
    2025-07-01 | PDF
    Intersection capacity, defined as the maximum number of vehicles that can pass through an intersection within a given time, directly influences traffic flow, congestion levels, and overall network efficiency. Accurate estimation of intersection capacity is essential for effective roadway planning, design, operation, and management. Intersection cap ...
  • Development and Use of UltraHighPerformance Concrete UHPC as a High Friction Surface Treatment HFST on Pavements and Bridges
    Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges
    Rangaraju, Prasad ;
    Maeger, Kyle
    2025-07-01 | PDF
    High Friction Surface Treatments (HFST) are proven crash reduction technology. However, their high cost necessitates exploring the use of alternative materials. This study assessed the design and application of Ultra-High-Performance Concrete (UHPC) as an alternative to traditional epoxy resin-based binder for HFST. In addition, the use of local al ...
  • Countermeasures for HighRisk Locations for Wildlife Related Crashes in Tennessee
    Countermeasures for High-Risk Locations for Wildlife Related Crashes in Tennessee
    Waldron, Brian ;
    Butler, Rebecca
    2025-07-01 | PDF
    A study funded by the Tennessee Department of Transportation (TDOT) and the Federal Highway Administration under RES2024-003 was conducted to assess the occurrence of wildlife-vehicle crashes (WVCs) along TDOT maintained routes in Tennessee and to explore potential mitigation strategies. WVC hotspots were identified by analyzing wildlife incident d ...
  • Crash Modification Factors for Super 2 Highways
    Crash Modification Factors for Super 2 Highways
    Brewer, Marcus A. ;
    Geedipally, Srinivas R.
    2025-07-01 | PDF
    Super 2 highways have been used across Texas for over 20 years, providing operational and safety benefits to rural two-lane highways at a lower cost than widening such facilities to four lanes. More Super 2 highways are planned as the demand increases on the state highway system. Previous research has provided insights on Super 2 safety, but update ...
  • GFRP Reinforced Bridge Barriers Impact Experiment Summary
    GFRP Reinforced Bridge Barriers: Impact Experiment [Summary]
    Wu, Chenglin
    ORCID ICON IMG
    2025-07-01 | PDF
    The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car ...
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