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.
Deterioration of the concrete bridge deck is one of the most significant problems affecting the service life of bridges in the United States. Moisture penetration into the asphalt overlay and standing water on the concrete bridge deck result in expansion and contraction at the interface on the bridge deck during freeze-thaw cycles. This causes debo
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The use of prefabricated components has been continuously gaining momentum in bridge construction because of its numerous advantages over conventional cast-in-place construction methods. However, there are few, if any, projects that have utilized prefabricated components to construct the entire bridge column/footing/pile system because the sufficie
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Studies over the past decade have shown that eco-driving systems which provide speed advisories to drivers/vehicles using data received via vehicle-to-infrastructure and vehicle-to-vehicle communications can help improve traffic mobility and reduce vehicle energy and emission levels. This study extends the Eco-Cooperative Adaptive Cruise Control (E
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Water within pavement layers is the major cause of pavement distresses. An increase in pore water pressure caused by traffic loadscauses fine particles of subgrade and subbase to migrate to base course layer. This migration results in the formation of void spacesand reduction in support of the pavement. On the other hand, migrated fines may clog th
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Research has shown that older pedestrians have more difficulty making road-crossing decisions than younger adults. This presents an opportunity for vehicle-to-pedestrian (V2P) communication to assist older adults’ street-crossing decisions. We developed ability-based permissive alerts (safe to cross) and prohibitive warnings (not safe to cross) for
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Four high-mast lighting towers (HMLTs) were instrumented with sensors to monitor weather and structural response to wind-induced vibrations. The four HMLTs were in different locales within the state of Wyoming, each site being selected specifically due to a history of failed HMLTs at those locations, or nearby. Several HMLTs have failed in recent y
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Biochar is a co-product of the production of advanced biofuels that sequesters carbon when used as a soil amendment. Gardening consumers are a potential market for biochar and their purchase of biochar-amended products could provide biofuel producers with an additional revenue stream. To better understand this opportunity, preferences for the attri
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Among the Kentucky Transportation Cabinet’s (KYTC) business units, the Department of Vehicle Regulation (DVR) has the most interactions with members of the public and other government agencies. Given its high profile and public visibility, it is critical for the department to provide high-quality customer service. Lacking data on customer perceptio
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This research focuses on automated processing of video from a persistent surveillance camera array to extract traffic data from a 25 square mile area. In previous research, we developed an automated traffic surveillance system capable of processing aerial camera array imagery to extract valid and useful traffic data for diverse applications. In thi
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Research has shown that older pedestrians have more difficulty making road-crossing decisions than younger adults. This presents an opportunity for vehicle-to-pedestrian (V2P) communication to assist older adults’ street-crossing decisions. The authors developed ability-based permissive alerts (safe to cross) and prohibitive warnings (not safe to c
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The early-age thermal development in mass concrete has a significant impact on the performance and long-term serviceability of mass concrete structures, such as bridge foundations. Great efforts have been made on predicting and controlling the thermal development in mass concrete. ConcreteWorks has been increasingly used for this purpose. However,
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This volume is the second in a series. The other volume in the series is: FHWA-GA-20-1918 Volume I: Assessing the Impact of Federal Requirements on GDOT Project Portfolio – Volume I The Georgia Department of Transportation (GDOT) is responsible for the state’s roads, bridges, interstate highways and other modes of transportation. In 2015, Georgia H
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The objective of this project was to enhance the capabilities of the pedestrian tracking system by adding support for detection and tracking of cyclists and vehicles, in addition to generating a set of tools to aid in analysis. Secondary tasks explored methods of enhancing the system capability for added value. The system analyzes the collected vid
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For the project “Data Analytics and Modeling Methods for Tracking and Predicting Origin-Destination Travel Trends Based on Mobile Device Data,” the Maryland Transportation Institute (MTI) at the University of Maryland worked with data provider partners such as mobile phone companies to determine if accurate and reliable origin-destination (OD) prod
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Many alternative intersections aim to reduce conflict points by separating turning vehicles (left-turning vehicles in most cases) at intersections. In order to investigate the safety effects of alternative intersections, data were collected from 27 states, including Arizona, Colorado, Florida, Georgia, Idaho, Indiana, Iowa, Kansas, Kentucky, Louisi
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Connected and autonomous vehicles (CAVs) have the capability to acquire real-time information from each other while human-driven vehicles (HVs) are standalone in the vehicle roadway navigation system. The information asymmetry poses great challenges in managing and controlling vehicles in the mixed traffic. To address such challenges, a new lane-ch
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This study focuses on the sexual harassment experiences of university students during their public transit journeys. We focus on university students because this group is typically more transit dependent than the general public, and possibly because of their age, more vulnerable to victimization from sexual harassment than other adults. Focusing on
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United States. Federal Highway Administration. Office of Safety Research and Development
2020-03-01
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Behavioral economics draws on insights from integrating psychology and economics to better understand human decisionmaking. Understanding cognitive biases and heuristics—such as loss aversion and present bias—may help policy makers predict human behavior and facilitate choices that support public benefits by avoiding suboptimal outcomes. Behavioral
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The rise in freight movements in metropolitan areas can be regarded as one of the crucial concerns of the near future. Traffic congestion attributed to elevated freight flows impacts both private and public vehicle operations. Therefore, it is of considerable significance to reduce congestion on multimodal routes with heavy freight and transit volu
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American roadways are becoming increasingly complicated and crowded as varying types of motorists and pedestrians share space. Motorists and pedestrians now must pay attention to newer vehicles such as autonomous vehicles (AVs) and e-scooters. State and local governments are seeking ways to design and operate roadways to include connected and autom
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