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.
Following a review of the lighting literature and new lighting products, this study examined the lighting level at the location of night fatal and incapacitating (K&A) pedestrian crashes over a 5-year period in SW & SE Michigan. Not surprisingly, the results revealed that almost all the night pedestrian crashes coded on police reports as occurring
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Transit agencies across the State of California struggle with the recruitment and retention of a sufficient transit operator workforce. This shortage is intensified by current and anticipated retirements among the transit operator workforce, as well as state laws and policy initiatives that require a well-trained and compliant transit operator work
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This research study investigated the feasibility of two shear-strengthening techniques to assess their effectiveness in enhancing the shear capacity of existing reinforced concrete girder bridges. The first scheme consisted of using Near-Surface-Mounted (NSM) bars while the second scheme comprised Partially Embedded Bars (PEB) in the web of the gir
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Transportation agencies and state DOTs have established roadside vegetation programs to enhance sustainability, quality of life, and the aesthetics of the transportation systems. However, a comprehensive toolkit to quantify the benefits and risks of various roadside vegetation types and applications has been largely lacking across the nation, inclu
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Transportation agencies and state DOTs have established roadside vegetation programs to enhance sustainability, quality of life, and the aesthetics of the transportation systems. However, a comprehensive toolkit to quantify the benefits and risks of various roadside vegetation types and applications has been largely lacking across the nation, inclu
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U.S. Chemical Safety and Hazard Investigation Board
2025-01-14
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The U.S. Chemical Safety and Hazard Investigation Board has released a compilation of summaries of chemical accidents that have occurred since the agency’s accidental release reporting rule went into effect in March 2020. The compilation presents summaries and probable causes of 26 incidents in chronological order, beginning with the release of hyd
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Automated vehicles (AVs) rely heavily on roadway infrastructure to function. This project used technology-equipped research vehicles to drive over 1,000 miles of Minnesota roadways to gain a better understanding of potential infrastructure issues that would inhibit the operations of AVs. The outcomes of this project were intended to be used by tran
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This project investigated the effect of various experimental parameters on the static flexural capacity of longitudinal joints in Commonwealth of Pennsylvania precast concrete bridge deck panel systems. The laboratory component of this study included fifteen full-scale static flexural tests of laboratory-assembled precast concrete deck systems that
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Modern asphalt mixtures are usually a combination of various materials from different sources, including reclaimed asphalt pavement (RAP) and recycling agents (RAs), and are used to attain sustainable growth. However, the lack of a well-established method for determining compatibility between various sources and types of virgin binder, aged binder
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A two-span bridge, supported by steel H-piles and mechanically stabilized earth (MSE) bridge abutments, was constructed as part of a new interchange on I-65 in Whitestown, Indiana. The east and west MSE abutment walls consisted of precast concrete facing panels, ribbed steel strips, and coarse-grained backfill soil. A section near the middle of the
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A two-span bridge, supported by steel H-piles and mechanically stabilized earth (MSE) bridge abutments, was constructed as part of a new interchange on I-65 in Whitestown, Indiana. The east and west MSE abutment walls consisted of precast concrete facing panels, ribbed steel strips, and coarse-grained backfill soil. A section near the middle of the
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This project examined the use of the light weight deflectometer (LWD) and the air permeameter test (APT) for control of the state of compaction and hydraulic conductivity of aggregate drainage layers. The investigation included an extensive program of LWDs, APTs, and nuclear density tests on two testing strips constructed at an experimental site—on
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As Florida’s aging population increases, the demand to ensure safe mobility for older adults also increases, especially since aging road users are vulnerable to serious and fatal crashes. Over 20% of Florida residents are aged 65 or older, and this number is projected to increase by 2045. Age is linked with a decline in vision, cognition, and react
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This study on full depth reclamation (FDR) with asphalt binders was aimed at updating FDR mix design procedures for the Texas Department of Transportation’s (TxDOT’s) 2024 Standard Specifications. The study included a literature review, a laboratory factors study, an interlaboratory study, and field evaluations. The literature review examined the u
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With the growing adoption of electric vehicles (EVs) in the United States and by Texans, Texas needs adequate and comprehensive coverage of EV charging infrastructure. Although currently comprising slightly more than 1 percent of all registered vehicles in Texas, many projections forecast that EVs could comprise up to 55 percent of all vehicles by
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Rumble strips are designed and deployed to reduce run-off-road and head-on crashes by alerting drivers about near-lane departures. Although they have been widely used, their operational safety effectiveness still needs to be investigated under various operational conditions. Rumble strips may have different widths and be installed on edge, shoulder
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The objective of this project was to evaluate the effectiveness of the Mobility Energy Productivity (MEP) metric—a qualitative framework that assesses the quality of mobility in transportation systems when considering accessibility, energy consumption, and productivity—as a tool to provide additional performance measures to enhance decision-making
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Test procedure to develop a laboratory mixture design for the full depth reclamation (FDR) of roadways using emulsified asphalt (emulsion). This procedure will determine a moisture-density curve, optimum emulsion content, and when necessary, a target additive content based on the indirect tensile (IDT) strength of unconditioned and moisture conditi
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The use of de-icing salts on roads during the winter months has caused corrosion damage to bridge reinforcements, which has increased maintenance costs. The corrosion protection system most widely used by various State Departments of Transportation is a combination of quality concrete, adequate cover, and fusion bonded epoxy-coated reinforcing bars
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ODOT’s Research Newsletter is designed to provide practice-ready solutions to real-world issues facing Ohio’s local transportation system through research. It’s a multi-organizational collaborative effort to improve the transportation network in Ohio’s counties, townships, cities and villages.
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