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.
This project investigated the use of evolving machine vision technologies to improve asset management procedures. Machine vision is technology that enables machines to “see” and interpret images, similar to how humans see and understand the world. It includes capturing an image, analyzing the image, and then completing and action or decision based
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Temporary bridges are systems designed for an expected service life of 5 years. In 2011, the California Department of Transportation issued a memo to designers advocating the use of design spectra corresponding to a return period of 100 years for temporary bridges. However, broad consensus on the most appropriate hazard level and design approach is
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Roadside vegetation composition assessment is essential to maintain ecological stability, control invasive species, and to ensure the adoption of environmental regulations around construction zones. Traditional monitoring methods involving visual inspections are time-consuming, labor-intensive, and not scalable. Remote sensing offers a valuable alt
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Highway construction workers operate in high-stress, hazardous settings where they have to perform physically taxing labor in environments where exposure to variable weather conditions, heavy equipment, high volumes of vehicle traffic, and other conditions that induce stress and anxiety are the norm. Up to 70% of workers in this industry have repor
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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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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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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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Alkali-silica reaction (ASR) remains a significant durability concern in concrete pavements, leading to internal cracking, surface deterioration, and loss of ride quality. Although preventive measures have reduced ASR in new construction, pavements built in Minnesota in the 1980s and 1990s continue to exhibit distress. This study evaluates maintena
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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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This research report reviews best practices in pedestrian outreach and engagement from various state, regional, and city agencies that will guide pedestrian outreach for the New Mexico Department of Transportation (NMDOT) Pedestrian Safety Action Plan (PSAP). This report summarizes insights from interviews with government personnel overseeing pedes
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Current test procedures in TxDOT specification Item 300, “Asphalts, Oils, and Emulsions” were reviewed for relevance, applicability, accuracy, and practicality, and recommendations were made for improving the tests and specifications. New test procedures were developed, as identified, to fulfill needed changes. Data for new proposed test procedures
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The scope of this study included a thorough evaluation of the short-term and long-term performance of Spray-on Rejuvenators (SORs) to assess their effectiveness in extending asphalt pavement life. Laboratory testing on cores extracted from field included a modified Bending Beam Rheometer (BBR) to measure creep stiffness at different temperatures (2
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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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The potential for walking and cycling and related modes such as wheelchairs which we call “active transportation” throughout this playbook—to take center stage is demonstrated in cities worldwide. Amsterdam and Copenhagen are known to tourists and urban planners worldwide for their bicycle infrastructure. Throngs of pedestrians are a hallmark of po
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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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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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This Research Summary is part of the final deliverable for Report 2025-24, "Development of a Process to Lower Global Warming Potential of Construction Materials."
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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This Research Summary is part of the final deliverable for Report 2025-29, "Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights."
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