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 main goal for this research was to evaluate the effectiveness and practicality of deploying and operating selected WZIA systems in California work zones. The objective was to provide recommendations and guidance to Caltrans on implementing such systems in real-world conditions through field observations and feedback provided by the Caltrans mai
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Geophysical methods can provide fast and reliable information regarding sinkholes and karst features over a broad area of coverage. Often, these geophysical methods involve the solution to an inversion problem to deduce subsurface details based on surface measurements. Solution of the inversion problem is a non-trivial issue that has warranted sign
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Since 2008, the Louisiana Department of Transportation and Development (DOTD) has permitted the use of crumb rubber modifiers (CRM) in hot mix asphalt (HMA) mixtures in accordance with its specifications. However, crumb rubber (CR)modification has presented unique challenges during the design and production of the mixtures. Louisiana DOTD district
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The objective of this study was to evaluate the safety impacts of increasing the speed limit from 55 mph to 60 mph on twolane, two-way state highway road segments in Minnesota. An empirical Bayes (EB) before-after analysis was used to estimate crash modification factors (CMFs) for both segments and intersections. The segment analysis showed an 8 pe
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This evaluation determined the change in crash frequency, type or severity associated with longitudinal sinusoidal rumble strips on rural two-lane undivided Minnesota roadways constructed between 2018 and 2022. Crash modification factors (CMFs) were estimated using cross-sectional analysis to compare crash experience of locations with sinusoidal ru
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This research summary was created as part of Report 2023-24, "Guidelines for safer pedestrian crossings: Understanding the factors that positively influence vehicle yielding to pedestrians at unsignalized intersections," published June 2023.
The California Department of Transportation (Caltrans) occasionally conducts construction projects within the range of the San Joaquin kit fox (Vulpes macrotis mutica), which is a Federally Endangered and California Threatened species. Caltrans routinely implements mitigation measures to avoid or minimize adverse impacts to kit foxes. However, kit
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In FY2022, the MnDOT Office of Research and Innovation managed a total of 215 active and completed projects, of which 75 received partial or full funding from the Local Road Research Board (LRRB). Evaluating the benefits of this research and effectively communicating the benefits to diverse audiences serves several important purposes. It helps both
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Deer-vehicle collisions (DVCs) represent a significant hazard on Minnesota roads, with roughly 1,200 DVCs reported annually to the Minnesota Department of Public Safety (MnDPS) and many more going unreported. While DVCs are common across Minnesota, local variations in deer density as well as roadway characteristics and use patterns make DVCs more l
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There are new Wi-Fi channels in the 5.9GHz Dedicated Short Communications Band in the United States which once was licensed spectrum exclusively for IEEE 802.11p connected vehicle devices. Existing literature reports through simulations and modelling that unlicensed interference from low-cost Wi-Fi devices could degrade the quality of IEEE 802.11p
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The Ohio DOT Office of Local Programs hosted a peer exchange meeting on July 25–26, 2023. The peer exchange meeting was held for the purpose of benchmarking Ohio’s local-let program with those of departments of transportation (DOTs) in other states; collecting information and input on technological advances for data capture, reporting, and assuranc
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The Montana Department of Transportation (MDT) hosted a research peer exchange in Helena, Montana, on September 12-13, 2023. The objectives for this peer exchange were to identify actionable improvements to implement or change in the beginning (idea of contract) and the end of (research conclusion to implementation) of the research business process
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This white paper summarizes the results from three training classes on queue analysis in work zones. Accurately predicting the mobility impacts of work zones will enable designers to identify effective countermeasures to improve mobility and safety in work zones. The course provides hands-on training on basic analytical methods (queue analysis meth
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Despite intensive efforts on the part of the Utah Department of Transportation (UDOT) and Vision Zero, fatalities in the state of Utah have seen only a modest decrease, with the most recent years exhibiting an uptick in fatalities. Achieving a goal of zero road fatalities is of great importance to UDOT. Using an extensive network of contacts abroad
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Monitoring the spatial-temporal variation of surface moisture content in highway soil embankment/dam has a practical implication for earth embankment/dam safety. The knowledge of soil moisture content on the surface of earth embankment/dams can help engineers monitor the dynamic evolvement of slope stability due to the adverse effect of excessive m
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Monitoring the spatial-temporal variation of surface moisture content in highway soil embankment/dam has a practical implication for earth embankment/dam safety. The knowledge of soil moisture content on the surface of earth embankment/dams can help engineers monitor the dynamic evolvement of slope stability due to the adverse effect of excessive m
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Very bluntly, culture matters, particularly related to daily, human behaviors. Culture signifies a feature of individuals that affects multiple components of daily life, such as rearing children and acceptance of risk and health outcomes. Correspondingly, driving represents an essential feature of who we are as individuals. As driver and passenger
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