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.
Project 0-7231 evaluated the feasibility and readiness of Carbon Capture, Utilization, and Storage (CCUS) technologies for integration into Texas transportation infrastructure. The study provided a comprehensive review of CCUS methods, assessed material-based applications such as CO₂-injected concrete and bio-based alternatives, and developed a lif
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Common complete street traffic signal timing strategies include leading pedestrian intervals, exclusive bicycle and pedestrian phasing, transit and bicycle queue jumps, and more. These countermeasures are utilized to curb pedestrian and bicycle crashes with vehicles; however, they often come at the expense of decreased travel efficiency. Safety and
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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
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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
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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
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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
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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
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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
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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
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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
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This study examines the potential of air-coupled Ground Penetrating Radar (AC-GPR) systems to overcome limitations in the Texas Department of Transportation’s (TxDOT) current pavement evaluation practices. The research integrates a comprehensive literature review, a statewide survey of TxDOT districts on GPR usage and barriers, and a technical asse
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Centerline rumble strips (CLRS) significantly reduce severe head-on crashes on two lane roads, although installing CLRS in asphalt pavements may accelerate deterioration of the pavement at the longitudinal construction joint. Recent research has suggested chip sealing new rumble strips as a preventive measure; however, chip sealing immediately foll
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The limited availability of high-quality aggregates and rising transportation costs present ongoing challenges for pavement construction and maintenance in Minnesota. To address this, local agencies are increasingly exploring the use of lower-quality, locally available materials in pavement foundation layers. This study evaluates the performance an
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This Research Summary is part of Report 2025-37, "Analysis of School Bus Stop-Arm Violation Reporting and Enforcement in Minnesota: Lessons Learned and Opportunities for Process Improvements."
This Research Summary is part of Report 2025-36, "Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)."
The primary research objective of this project is to demonstrate the potential capability of emerging LiDAR sensing technologies in identifying and mitigating traffic conflicts (i.e., near-misses) at signalized intersections. The latest LiDAR sensing technologies allow for tracking vehicles and pedestrians (assigning each a unique temporary ID for
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Limited local availability often constrains the growing demand for high-quality aggregate materials in road construction. To address this challenge, recycled waste materials, including plastics, are being explored as sustainable alternatives. This study investigates the feasibility of incorporating recycled plastics into asphalt and concrete paveme
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The objective of the research project was to compare the performance of corrugated high-density polyethylene (HDPE) pipes manufactured with recycled content to those manufactured with only virgin materials. MnDOT currently requires HDPE pipes to be made with 100% virgin materials. However, recent changes to American Association State Highway and Tr
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