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.
Nebraska Department of Transportation (NDOT) staff frequently decide on changes to existing two-way stop controlled (TWSC) intersections on rural expressway to alternative facilities, such as a restricted crossing U-turn (RCUT), a roundabout, a signalized intersection, or an interchange. As Nebraska makes progress toward completion of its express w
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Ultra-high-performance concrete (UHPC) is an advanced cementitious material known for its exceptional strength and durability, making it an ideal material for bridge deck overlays and repairs that address the common issue of premature deck deterioration. Conventional UHPC is typically flowable and self-leveling, which makes it unsuitable for deck s
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This research proposal has five primary objectives: 1. Quantify the impact of RAP aggregate quality on overall mixture performance. 2. Investigate the influence of milling depth on RAP quality and its subsequent effect on mixturedurability.3. Evaluate the effectiveness of RAP fractionation in reducing the performance variability commonly associated
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This Strategic Plan (or Plan) establishes the U.S. Department of Transportation (Department or DOT) strategic goals and objectives for Fiscal Years (FY) 2026 through 2030. In accordance with the Government Performance and Results Act (GPRA) Modernization Act of 2010, Cabinet-level departments must develop a new Strategic Plan at the beginning of ea
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The methodology employed to achieve the project’s objective involves a systematic review of design guidance, standards, and recommendations relevant to hydrology and hydraulic design of transportation infrastructure such as drainage and stormwater systems. This involved reviewing various sources, including state departments of transportation draina
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The objective of this project is to use validated intelligent compaction (VIC) technology to map 1/4 to 1/3 of the unpaved gravel road network across the state of Iowa. This work will be done over 2 summer seasons to be completed in the 3-year time frame set forth in the AID Grant NOFO. The mapping will gather Modulus Values; Road Geometry (x,y,z);
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The objective of this to create a new application, similar to those already in use at the Service Bureau (SB) that the county engineers are accustomed to using. That application would be developed by the current SB programmers. Once completed all data collected across the State of Iowa by the mapping process including modulus values would be proces
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This study investigated the potential pavement performance, resiliency, cost-effectiveness, and environmental efficiency of incorporating locally sourced Illinois aggregates into stone-mastic asphalt (SMA) through an integrated laboratory and full-scale assessment. SMAs were designed using local aggregates with different lithology and durability le
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The Virginia General Assembly passed legislation in 2020 requiring the preparation of the Virginia Wildlife Corridor Action Plan. It directed the Virginia Department of Wildlife Resources in collaboration with the Virginia Department of Transportation, the Virginia Department of Conservation and Recreation, and the Virginia Department of Forestry t
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This study presents the development and implementation of a Balanced Mix Design (BMD) framework customized for Oregon’s materials, traffic, and climate conditions, aiming to improve asphalt pavement durability, environmental performance, and cost-effectiveness. While traditional volumetric mix designs have been widely adopted, they may sometimes le
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This research evaluates the safety performance of flashing yellow arrows (FYA) and driver behavioral responses in Nebraska, using data from 324 FYA intersections (Lincoln 160; Omaha 164) to develop evidence-based implementation guidance. The study addresses critical knowledge gaps in local driver acceptance patterns, the effectiveness of phasing co
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This study evaluates the effectiveness and operational implications of Temporary Portable Rumble Strips (TPRS) used by the Utah Department of Transportation (UDOT) to alert drivers to upcoming work zones. While TPRS are intended to capture driver attention and reduce crash risk, concerns remain regarding their influence on driver behavior, avoidanc
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Like many other state highway agencies, the Virginia Department of Transportation is extensively working to consider how to best incorporate recycled materials—such as recycled plastic, reclaimed asphalt pavement (RAP) at higher contents with and without the use of recycling agents (RAs), and other materials—into their roads while maintaining or im
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The project started with reviewing the literature of available datasets, established AI models and practices in the U.S. and other countries. The research team investigated the acquisition of high-resolution images with American Association of Highway and Transportation Officials (AASHTO) standard MP47 and created a tool for viewing the vendor’s da
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This report is the second part of a two-phase study to assemble performance-based design guidance for the evaluation and mitigation of severe fire hazards for highway bridges. The following are addressed: (1) summarize design-basis tools that can be used for “engineering analysis” per NFPA 502 Chapter 6 to calculate the thermo-mechanical impact of
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FDOT is seeking to maximize the durability of newly constructed structural elements. As part of this goal, FDOT needs to do a better job assessing concrete mixes for specific structural applications. This assessment needs to adapt to the ever-changing physical, chemical, and market issues associated with concrete’s constituent ingredients. FDOT nee
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The integration of truck platooning and electrification presents a promising avenue for improving operational efficiency and environmental sustainability in freight transportation. Realizing the energy and cost saving as well as emission reduction benefits requires a holistic design of truck routing, scheduling, and platooning strategies that accou
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Increasingly, researchers have used measures of material hardship (food, housing, utility, bills, medical) to better understand economic distress. Missing from this literature are hardships related to transportation. This descriptive paper uses recent nationally representative data and a newly validated measure of transportation insecurity to addre
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The primary objective of this study was to investigate the feasibility of using lignin, an environmentally friendly biopolymer, for sustainable protection of Kansas roadsides against wind and rainfall erosion during the critical stage of construction that occurs prior to the emergence of a vegetative cover. Results from laboratory-scale experiments
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Successful transportation messages are only effective if travelers can read and comprehend the message. However, text-based messages can be challenging for non-native English speakers or slow-reading populations, such as the elderly. The addition of graphics messages as a potential aid to improve message comprehension is uncertain, as is their effe
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