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.
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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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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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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The objective of this research was to determine the efficacy and cost-effectiveness of the application of tire-derived aggregate (TDA) in stormwater treatment and management systems. We reaffirmed that TDA is an excellent means of retaining phosphate (soluble reactive phosphorus) in stormwater runoff. In addition, we found that biofilms grow on TDA
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This research examines the value of financing infrastructure improvements through bonding versus a program of pay-go improvements. Postponed construction becomes more costly in nominal terms because inflation raises the cost of construction over a longer period before construction begins. However, postponements can also create a variety of other si
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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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A study funded by the Tennessee Department of Transportation (TDOT) and the Federal Highway Administration under RES2024-003 was conducted to assess the occurrence of wildlife-vehicle crashes (WVCs) along TDOT maintained routes in Tennessee and to explore potential mitigation strategies. WVC hotspots were identified by analyzing wildlife incident d
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Pile foundations were often driven into intermediate geomaterials (IGM) to support heavy civil infrastructures like bridges due to shallow bedrock stratigraphy. Thus, the pile foundations of this region must rely on the resistance contributed from the IGM layers. However, IGM is a transitional geomaterial between soil and rock, that needs to be bet
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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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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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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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The Alabama Department of Transportation (ALDOT) is currently using the Alabama Design and Analysis of Pavement Thickness (ADAPT) software for their structural pavement design process, which is based on the 1993 American Association of State Highway and Transportation Officials (AASHTO) Pavement Design Guide. In 2008, the American Association of St
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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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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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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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The objective of this project was to create a book that encompasses the Iowa Highway Research Board’s (IHRB’s) history and funded projects from 2000 to 2024.
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 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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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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