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.
Freeway ramp merging involves conflict of vehicle movements that may lead to traffic bottlenecks or accidents. Thanks to advances in connected and automated vehicle (CAV) technology, a number of efficient ramp merging strategies have been developed. However, most of the existing CAV-based ramp merging strategies assume that all the vehicles are CAV
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The asphalt industry is moving towards performance-based methods for asphalt mixture design. The Federal HighwayAdministration (FHWA) is supportive of state departments of transportations (DOT) adopting index and predictive performance tests, especially those making use of the Asphalt Mixture Performance Tester (AMPT). The FHWA is therefore encoura
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Transverse cracks in concrete bridge decks sometimes initiate in the early stages of the bridge service life, usually just after construction. Cracks in the bridge deck can accelerate the deterioration of the deck concrete, provide a direct pathway for the intrusion of water and chlorides to the deck reinforcement, and detract from the aesthetics.
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This research project examines the safety performance of unsignalized intersections on rural divided highways in Alabama. A summary of the safety problem at these intersections is provided; the concern is the relatively high frequency and severity of crashes at these locations, typically associated with vehicles entering from the minor road and fai
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Tennessee is home to some of the most popular tourist destinations in the country and the tourism industry contributes considerably to Tennessee’s economy. The industry in the state has grown considerably in the previous years and there is a need to identify and address issues related to transportation services to accommodate needs and requirements
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The objective of this project was to evaluate the feasibility of using roadway friction data as a key component of a winter maintenance performance management tool by the Colorado Department of Transportation (CDOT). Work accomplished to support these findings identified states and countries that are using roadway friction data in performance manag
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In order for UHPC to be implemented in Florida structures and realize its potential benefits, research was needed to develop specifications for UHPC materials not supplied as prebagged materials. The research objective of this project was to establish mixing, placing, curing and durability requirements and test methods necessary to produce durable,
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This project investigated the long-term protection of steel piles with galvanized and painted galvanized coatings using a corrosion chamber to accelerate corrosion effects in the laboratory. Further investigation was completed through observation of painted galvanized piles installed in the field at a newly constructed bridge in Buchanan County, Io
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The primary goal for this project was to evaluate the efficacy of A709 Grade QST 65 steel for use in Iowa bridge projects. The objectives of the project were as follows: Identify the current state of use of A709 Grade QST 65 steel in bridge projects; Identify the ductility and strength characteristics of A709 Grade QST 65 steel through full-scale l
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Disabled and abandoned vehicles (DAVs) are a common occurrence on Florida roadways. This research focused on evaluating the operational and safety impacts of DAVs and identifying and evaluating methods to reduce these impacts. A comprehensive literature review showed that previous studies focused on DAV response (including the use of innovative tow
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The Indiana Department of Transportation (INDOT) uses about 600 digital cameras along populated Indiana highways in order to monitor highway traffic conditions. The videos from these cameras are currently observed by human operators looking for traffic conditions and incidents. However, it is time-consuming for the operators to scan through all vid
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This study explores the nature and extent of problems related to pedestrian user experience at Minnesota roundabouts. Pedestrian user experience in this study is measured by way of studying driver-yielding rates toward pedestrians at Minnesota roundabout crossings, pedestrian infrastructure design, and pedestrian behavior characteristics at Minneso
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This technical report describes the sample design, data collection, data coding, weighting, estimation methods, and findings of the Medium-Truck Special Study (MTSS), the purpose of which is to identify critical reasons for the critical events and causal factors in fatal crashes and to assess if crash avoidance technologies could have affected the
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The 24/7 Sobriety Program is an intervention strategy mandating that alcohol-impaired driving offenders remain sober as a condition of bond or pre-trial release. The goal is to monitor the most at-risk offenders in North Dakota and require that these individuals remain sober in order to keep roadways safe from hazardous drivers. As a component of t
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Horizontal curves can improve the safety and comfort of a ride for drivers and passengers by preventing a sharp turn from one direction to another. However, the role of curves in vehicle crashes and their safety impacts are underestimated due to the substantial number of curve-related crash misclassifications in CRIS. Therefore, there is an urgent
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Florida’s massive population growth brings higher emphasis on the freight and logistics aspect in Florida and the challenge of maximizing the economic development potential by attracting more companies to the State. Above mentioned challenge necessitated this project to find optimal areas which are most suitable for logistics activities to be locat
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2022-09-01
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This edition of Traffic Safety Facts briefly summarizes motor vehicle crash data from 2020 and compares them to the period 2011 to 2020. Among the key findings: In 2020 an estimated 38,824 people were killed in 5,250,837 police-reported traffic crashes and an estimated 2,282,015 people were injured, a 6.8 percent increase in fatalities compared to
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In this study, the research team determined if raveling can be assessed through Florida’s existing pavement condition survey or through new 3D pavement surface data collection systems currently being implemented by Florida. Once raveling is accurately accounted for separately, it should then be accounted for in subsequent pavement performance forec
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