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 objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Lou
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Transportation agencies have long communicated directly with truck drivers regarding weigh station compliance and parking availability, sometimes making use of applications provided by private third-party partners. One of these applications has expanded capabilities that allow agencies to transmit safety alerts directly to drivers through the in-ca
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A 100-ft field implementation of the proposed solar snow fence was conducted In Glyndon, MN. The implementation process started with the manufacturing of solar stripe frames, U connection with steel posts, helical piling, electrical power harvest and storage, electrical use in snow melting, and monitoring of the solar snow fence systems. A 12-ft la
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Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr
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Part-time shoulder use (PTSU) has emerged as an effective lane-use strategy to mitigate both recurrent and non-recurrent congestion. Given the operational and safety benefits associated with the US-23 Flex Route, this research project focused on evaluating the feasibility of PTSU on selected freeway corridors in Michigan that are prone to such cong
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This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance
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The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t
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This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance
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The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t
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Accelerated bridge construction (ABC) using precast concrete bents has substantial potential to improve construction time and seismic performance in earthquake-prone regions. This study investigates the seismic performance of hybrid self-centering bridge bents that employ unbonded post-tensioning (PT) bars for self-centering and replaceable stretch
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Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c
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Bats are a critical component of our natural world, and many species are at risk. Protecting roosting habitat is one way we can help conserve a variety of species. Although many bats use natural roosts, a growing number are adapting to anthropogenic structures due to habitat encroachment. In this study, we tested methods for detecting bats using br
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The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit
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Wildlife-vehicle collisions are a common and costly occurrence on U.S. roadways. An estimated 1 million vertebrates are killed on American roads each day. Most wildlife-vehicle collisions of importance occur with deer. The goal of the proposed research is to better understand wildlife-vehicle collisions in Illinois and to identify mitigation strate
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Moisture-induced damage in asphalt pavements poses a significant concern for road agencies, affecting both long-term performance and driving safety. Most road agencies have relied on the Modified Lottman (ML) test, following the AASHTO T 283 standard, to assess the moisture susceptibility of asphalt mixtures. However, researchers have questioned th
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This research project’s objective was to investigate the impacts of transit stop location (near-side versus far-side) on pedestrian safety and traffic operations at intersections. Three different video-based behavioral observation data collections at signals in Utah were utilized and studied: (1) transit stop events (interactions between transit ve
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The Illinois Department of Transportation (IDOT) manages land with considerable conservation value. Some IDOT roadways contain, or are near, special management areas (SMAs): places that have legal protection, are habitat for species with legal protection, or contain valuable biodiversity. Although SMAs are important for IDOT’s environmental objecti
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Truck Mounted Attenuators (TMAs) are designed to mitigate crash severity. Currently, TMA drivers rely on visual checks via driving mirrors to manually trigger warnings thus placing the duty on drivers. To address this limitation, the Automated TMA Warning System (AutoTMA) replaces or augments manual driver interventions with an AI-enabled, sensor-f
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The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit
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Truck Mounted Attenuators (TMAs) are designed to mitigate crash severity. Currently, TMA drivers rely on visual checks via driving mirrors to manually trigger warnings thus placing the duty on drivers. To address this limitation, the Automated TMA Warning System (AutoTMA) replaces or augments manual driver interventions with an AI-enabled, sensor-f
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