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 researchers created and validated a Texas corrosion risk assessment map (Figure 1) based on corrosion modeling in which Region 1 corresponds to a low risk of corrosion and Region 6 corresponds to a high risk of corrosion. To assess corrosion prevention and mitigation techniques applied on steel and concrete bridges, over 100 bridges were inspec
...
This document serves as a comprehensive guide on how to use the SAM AV Module within the context of the 5-7081-01 implementation project. This module is a variation SAM-V4 model (Statewide Analysis Model) modified to include autonomous vehicles (AVs), shared autonomous vehicles (SAVs) and autonomous trucks (ATrucks). This project introduces autonom
...
The objective of this project was to establish a new HMCL mix design method with an SGC and new performance tests, ensuring high-quality and long-lasting HMCL mixes.
This research was conducted to analyze the lifetime costs associated with concrete barriers, steel guardrails, and wooden versus metal guardrail posts and signposts. In this study, a comprehensive lifecycle cost analysis and cost-benefit evaluation framework was developed that can be used to facilitate decision making processes to mitigate safety r
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.