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 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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Although the Vermont Standard Specifications for Construction identify an acceptable delay in work zones of less than 10 minutes per operation and less than 15 minutes cumulatively for a project maintaining one-way traffic, it is recognized that these thresholds have been set without consideration for context, procedures for measuring delay, or met
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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
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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
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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
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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
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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
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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
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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
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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
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