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 objectives of the project are to: 1. Develop cost-efficient recommendations for maintaining marking retroreflectivity at or above minimum levels on Louisiana state highways; 2. Improve understanding of pavement striping practices and material performance factors that influence the durability and long-term retroreflectivity of pavement markings;
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Transverse cracking, a primary distress in cold-climate asphalt pavements, can lead to tenting, an upward distortion caused by ice formation in the base layer and at the interface of the surface and base layers. This research investigated pavement treatment efficacy and core tenting mechanisms through field measurements in six selected roads in Min
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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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This policy brief is drawn from “Transportation Challenges of Low-Income Households with Children: A Case Study in South Los Angeles,” published in the Journal of Planning Education and Research, with funding received by the University of California Institute of Transportation Studies through the Road Repair and Accountability Act of 2017(Senate Bi
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Playa lakes, arid regions, and karst terrains are significant geographic and hydrological features throughout Texas, each posing unique challenges due to their complex and varied hydrology. Currently, there are no standardized guidelines or criteria for the hydrological and hydraulic design of transportation infrastructure in these landscapes, whic
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The primary objective of this project was to compile and synthesize current knowledge and practices related to hydrological approaches for playa lakes, karst terrains, and arid regions. To achieve this, the project began with a comprehensive evaluation of existing research, design guidance, standards, and practices for hydrological studies in these
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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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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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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 purpose of this study was to advance the objectives of the legislated WCAP by developing species-specific road risk models and identifying road segments that pose a high risk to small priority species. The study also highlighted potential approaches to improving road-crossing connectivity based on species-specific movement corridors and road ri
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This research project sought to better understand factors affecting electric vehicle (EV) adoption, use, and charging behaviors in Utah, and any differences between urban and rural areas. To accomplish this goal, three key datasets were used: Utah’s 2023 household travel survey, 2015–2024 Utah vehicle registrations by county, and a 2021–2023 survey
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The objective of this is 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 pro
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This report describes the development of a spreadsheet-based modeling framework for calculating lifecycle economic and energy costs of new Express Lane facilities. The report discusses relevant background information, spreadsheet-based model structures, and development of spreadsheet calculation methodologies. The report also describes the developm
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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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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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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 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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