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.
Led by the Integrated Mobility Division (IMD), the North Carolina Department of Transportation (NCDOT)'s Connected Autonomous Shuttle Supporting Innovation (CASSI) is the state's flagship automated shuttle pilot program. CASSI introduces the public to automated vehicle technology through free shared rides and showcases how the technology works for
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The objective of this research project was to determine where, when, and why a prime or cure is needed for a pavement layer. Materials such as prime coats, curing materials, seal coats, and tack coats are typically considered nonstructural but integral to the pavement structure. Some materials can be used for multiple purposes, such as to prime, bo
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Indiana’s 2016 House Enrolled Act (HEA) 1001 provided a funding mechanism for transportation infrastructure that required Local Public Agencies (LPAs) to have an Asset Management Plan (AMP) to be eligible for funding. In 2022, the Indiana General Assembly desired to know the extent to which LPAs had adopted AMPs in response to this legislation. Thi
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This report presents a guidebook for the management of environmental risk in the post-let phases of alternative delivery projects. Common challenges to environmental analysis and permitting are presented, in addition to a series of best practices and opportunities to promote efficient outcomes within the context of public-private partnerships, incl
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The objective of this project was to identify and compare suitable technologies that could provide cost-effective and reliable information about occupancy levels. The team assessed numerous technologies, including Wi-Fi, Bluetooth, infrared sensors, cameras, and crowd-sourced data.
Tennessee does not currently have procedures or specification requirements that fully support the use of optimized gradations in concrete mixtures. This research project focused on optimizing aggregate gradation for concrete mixtures used by the Tennessee Department of Transportation (TDOT), aiming to improve concrete durability, economy, and susta
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Efficient road management requires collecting and analyzing various geospatial data related to transportation corridors. Mobile Mapping Systems (MMS), integrated with GNSS/INS units, RGB cameras, and LiDAR technology, enable the collection of geo-tagged imagery and 3D point cloud data across roadway networks. Acquired data helps in the inventory an
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The objective of this research project was to develop a reliable method for estimating the in-pile grout volume of auger cast piles. The study also sought to standardize best practices to ensure compliance with Federal Highway Administration (FHWA) recommendations and State requirements.
This report presents the findings from focus groups conducted in 2024. The primary objective of the research was to provide a comprehensive analysis of the impact of Act 130 within Pennsylvania's unique context. The study examines the specific benefits and challenges of Highly Automated Vehicles (HAVs), with a focus on workforce development, econom
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To date, most of this research has focused on understanding transportation insecurity at the national level. But there is likely wide variation in patterns of transportation insecurity by state, region, and city, with implications for policy. In this paper we examine what transportation insecurity looks like in Detroit. We do so by considering the
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The research team planned and executed this project in two phases. The project began with foundational research and a literature review, during which the team compiled a broad catalog of practical AI applications. A practitioner-focused phase followed, drawing out real-world insights related to AI policy and implementation. The research team implem
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Efficient and accurate record-keeping for maintenance vehicle operations is essential for optimizing resources, improving accountability, and enhancing decision-making for transportation agencies. The Indiana Department of Transportation (INDOT) sought an automated system to verify and improve work order records using telematics-based vehicle track
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Accurate cost estimation plays a pivotal role in effective budget planning for highway construction projects, ensuring that resources are allocated appropriately and projects are completed within financial constraints. Traditional cost estimation methods, commonly used by transportation agencies like the Michigan Department of Transportation (MDOT)
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High-strength reinforcing steel has been incorporated into design specifications and permitted under certain provisions of concrete building and bridge design codes, highlighting its growing recognition in construction. The employment of high-strength reinforcing bars offers several potential advantages, including reduced reinforcement quantities,
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This report presents two major aspects related to the end-zone behavior of prestressed concrete bulb-tee girders: i) laboratory experiments and ii) full-scale finite element modeling. The first part of the report discusses the behavior of anchorage zones, also known as end zones, with discrete rebars and continuous meshes. To examine the implicatio
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Performance Engineered Mixtures (PEMs) have been the primary focus of concrete mixture research on a national level for years. Tennessee has facilitated several projects over the years to move facets of PEM forward, including Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes through Improved Air Void Testing (RES2020-09) and Determining
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This report presents two major aspects related to evaluating timber bridges with nondestructive testing: i) laboratory experiments and ii) field applications. The first part of the report discusses the degradation processes and resulting outcomes of structural timber, Douglas Fir, that is broadly used for bridge construction. In accordance with the
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This project developed a GIS to assist with the identification of deeply buried cultural deposits in alluvial settings across the Sandhills region of Nebraska. Soil survey data, previous geoarchaeological investigations, landform position, and other information was used to rank the potential of any stream valley setting as low, low-moderate, modera
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The accumulation of sediments at culverts is a chronic operational issue, frequently occurring at multi-barrel culverts located in erosion-prone watersheds. Sediment deposits can develop rapidly, impairing the culvert’s capacity to convey design flows and potentially leading to damage to both transportation infrastructure (e.g., road and culvert ov
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