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 reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car
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To guide databases that track progress on the uptake and use of zero emission trucks and buses, this project identified types of data that should be collected on a regular basis and compiled in a repository, preferably with public access. Funding will need to be identified to support this effort on an on-going basis. Data recommended for collection
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Although the Highway Capacity Manual (HCM) provides default values for its methodologies, it also states that these values represent typical national values and that conditions within a state, region, or community may differ. When default values are applied frequently in analyses, the use of local default values can reduce the uncertainty in the an
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This research study developed and evaluated prefabricated steel bridges made continuous for live load utilizing accelerated bridge construction (ABC). The project created a steel ABC transverse connection detail at the bridge piers that allows the structure to behave as simply supported for dead load and continuous for live load. This detail is rel
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The objective of this project was to develop a method to prevent errant motorists from entering the median openings between parallel bridge structures. This project identified characteristics that could be used to target potential sites for implementation of a median opening protection system (MOPS). In this identification process, the research tea
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Conventional high-speed inertial profilers provide valid international roughness index (IRI) measurements under favorable conditions but experience performance degradation at low speeds, during deceleration and acceleration, or when coming to a stop. Due to these limitations, Louisiana DOTD does not compute performance index (PI) values for certain
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This research project expanded on the three previous LTRC geotechnical database efforts to improve and advance geotechnical data management within the Louisiana Department of Transportation and Development. This project facilitated the implementation of Bentley’s OpenGround Cloud (OpenGround). The project uploaded historical boring log images and d
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This research project expanded on the three previous LTRC geotechnical database efforts to improve and advance geotechnical data management within the Louisiana Department of Transportation and Development. This project facilitated the implementation of Bentley’s OpenGround Cloud (OpenGround). The project uploaded historical boring log images and d
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Conventional high-speed inertial profilers provide valid international roughness index (IRI) measurements under favorable conditions but experience performance degradation at low speeds, during deceleration and acceleration, or when coming to a stop. Due to these limitations, Louisiana DOTD does not compute performance index (PI) values for certain
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Transit is frequently treated as a financial burden rather than a public investment, where the value is assessed primarily in terms of ridership or farebox recovery. This framing misses a wide range of external benefits, including workforce participation, healthcare access, and local economic activity. Additionally, public discourse and scholarly r
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Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man
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United States. Department of the Interior. National Park Service. Washington Area Support Office
2025-07-01
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The 2024 NPS Transit Inventory and Performance Report communicates the service-wide outcomes and status of National Park Service (NPS) transit systems. This comprehensive listing has been compiled annually in this format since 2012 and covers on- and off-road, waterborne, and airborne systems. The inventory establishes a working definition of NPS t
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Texas Department of Transportation (TxDOT) determines unit prices of pay items using the historical bids-based estimation method and then develops an engineer’s project appraisal. The engineer's estimate is used to assess the bids and select the bidder. However, the unit price of a work item is heavily affected by various project-specific and exter
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This research was completed to provide recommendations to create a standardized operational framework or pilot training program for Utah Department of Transportation (UDOT) Unmanned Aircraft Systems (UAS) which are used for infrastructure inspections, traffic monitoring, emergency response, and data collection. This will improve safety practices, r
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Despite recent changes to MnDOT mix designs, transverse cracking has still been observed shortly after the bridge deck is poured. The goal of this research was to determine the causes of this cracking and to propose deck reinforcement or mix design practices that efficiently mitigate the problem. Initial investigations focused on synthesizing exist
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Truckers often struggle to find parking to take legally required breaks, which is not only an inconvenience for drivers, but also poses a safety risk for the motoring public. MnDOT is testing a detection system to identify the number of available truck parking spaces at the Heath Creek Rest Area (Northbound) located at M.P. 68.1 North of Faribault
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The objective of this project is to develop knowledge, tools, and protocols to inform best practice standards for effective implementation of biochar in bioretention systems (BRSs) for treating roadway runoff. This project will be performed in two phases, with the first phase (this report) focusing on biochar production, characterization, and conta
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The purpose of the Michigan Department of Transportation (MDOT) Unmanned Aircraft Systems (UAS) Communications Mesh Test Deployment project was to evaluate the feasibility of using short-range wireless mesh networks to support Beyond Visual Line of Sight (BVLOS) operations for UAS. The project focused on integrating Dedicated Short-Range Communicat
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The durability of concrete structures is dependent on the restrained shrinkage behavior of the mix: therefore, evaluating mixtures with different aggregates and mitigation measures is critical. The aim of this document is to evaluate and compare concrete mixture designs using granite and limestone aggregates in combination with different mitigation
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Reinforced soil slopes (RSSs) can be a feasible solution for embankments where there exist right of way restrictions, environmental issues, rolling or mountainous topography, unfavorable geology, and other limiting fac-tors. They can be an alternative to retaining walls or importing select fills to construct steeper, stable embankment slopes where
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