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.
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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Micromobility has become increasingly popular in cities across Florida and the nation, offering a convenient, flexible, and accessible alternative for short-distance travel, particularly for first-and last-mile transportation. However, most areas of Florida and even the nation currently lack a framework and established practices for micromobility a
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A recent study determined that the Virginia Department of Transportation (VDOT) can use up to 30% reclaimed asphalt pavement (RAP) in a pavement base aggregate layer without adverse effects on pavement performance. However, an effective quality-control protocol to monitor construction is needed to implement the use of RAP in the base course. The st
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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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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)."
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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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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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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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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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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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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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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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."
Built on three pillars of economic development, innovation, and partnerships, I-STREET™ is a real-world transportation testbed developed to enhance transportation safety and mobility. The testbed allows researchers to develop, test, and evaluate emerging technologies in a live environment with real traffic, covering a variety of transportation mode
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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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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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The use of reclaimed asphalt pavement (RAP) in asphalt mixtures has been steadily increasing for years, nationally and internationally, given the economic and associated environmental benefits of using such material. However, using RAP in asphalt mixtures poses some challenges regarding durability and performance that are often associated with the
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The Virginia Department of Transportation (VDOT) has adopted the balanced mix design (BMD) framework to enhance the durability and service life of its dense-graded asphalt surface mixtures with A and D designations. VDOT’s BMD framework incorporates the indirect tensile cracking test to assess the cracking susceptibility of asphalt mixtures through
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