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.
Numerous modeling studies point to an intensification of the hydrological cycle under projected climate warming, with increasing frequency of extreme events, including heavy rainfall and flooding. So, what would projected changes in flooding mean for the Iowa Department of Transportation (IDOT) and the bridges and structures that constitute Iowa’s
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In 2018, the Minnesota Department of Transportation (MnDOT) constructed a pair of side-by-side bridges on TH 169 over Elm Creek, with glass fiber-reinforced polymer (GFRP) reinforcement used in one deck and conventional epoxy-coated steel reinforcement used in the other. To understand the behavior of GFRP reinforcement and compare the performance a
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The overall objective of this project was to understand how advanced materials can be used to improve the durability of reinforced concrete transportation infrastructure in the State of New Jersey. A primary focus of the research program was to investigate highly ductile concrete materials, often referred to as high-performance fiber-reinforced cem
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Measuring equity in transportation is vitally important to ensure that the transportation network serves the entire community without introducing barriers to access. However, not all methods for assessing transportation equity produce the same results or are appropriate for all scenarios—the analysis methods used should be selected to produce the h
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The goal of this project was to develop a tool to aid railroads and other stakeholders assess and approach the decarbonization of freight rail operations by identifying new, viable low-carbon energy storage and conversion systems for future locomotive systems and how they should be deployed on the existing US freight rail network.This record also c
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This report describes a process to estimate AADT on non-Federal-Aid public roads (collectively called “off-system” roads) in Idaho. This will provide additional data for ITD and regional and local transportation agencies to conduct analysis, and it will meet new federal requirements for estimating AADT on all public roads. The report includes a rev
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In general, tunnels are designed with an abundance of safety regarding structural integrity, however, there can be uncertainty related to structural performance after a fire event. The residual condition of a tunnel after a fire is dependent on fire intensity and duration. The goal of this study is to correlate visual and material characteristics o
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This study explores the effects of increases in online activities (such as telecommuting and online shopping) as well as shifts toward electric vehicles on transportation revenues for the District of Columbia (DC). The analysis is based on (1) a review of the literature and state of practice regarding online activities, trends in vehicle fleet mix,
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Field contamination of friction pendulum system (FPS) isolation bearings (water, ice, dirt and other debris) has been observed in several Alaskan bridges during routine bridge inspections. Characterization testing was performed on four FPS bearings in clean/dry conditions as well as wet, frozen and soil-filled. Three of the four were double pendulu
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Field contamination of friction pendulum system (FPS) isolation bearings (water, ice, dirt and other debris) has been observed in several Alaskan bridges during routine bridge inspections. Characterization testing was performed on four FPS bearings in clean/dry conditions as well as wet, frozen and soil-filled. Three of the four were double pendulu
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This project is designed to provide the North Carolina Department of Transportation (NCDOT) with implementation-ready tools for incorporating data-driven socioeconomic measures into the Strategic Transportation Investments (STI) prioritization process for pedestrian, bicycle, and transit projects. This research will equip NCDOT with the tools neede
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What transit will look like in the future depends on how it is funded now. Funding can lead planning (Taylor, 2000), especially in setting the agenda for agencies to follow. How transit is funded, therefore, is at least as important as the level at which transit is funded. This brief focuses on the Transportation Development Act (TDA) because of it
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Project Bundling is an innovative contract procurement strategy that is being widely used in bridge and highway projects to save project delivery time and costs. The guidebook developed by FHWA on project bundling also provides a wealth of information on project bundling. However, the guidebook is primarily focused on the project bundling practices
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The Savannah Harbor’s dredged material containment areas are spread across 7,000 acres along the South Carolina side of the lower Savannah River. A demonstration project to determine whether dredged material could feasibly serve as landfill cover was undertaken. As such, the long-term project viability, including post-construction geotechnical and
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Minnesota statute provides for a wide range of school zone speed limits (SZSLs) from which local authorities may select. This Transportation Research Synthesis summarizes the current research regarding setting SZSLs, effective methods and procedures for setting school zone speed limits and known spillover or other unintended consequences for settin
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Since the mid-1990s, the use of Speed Safety Cameras (SSCs), also referred to as Automated Speed Enforcement (ASE), as a speed reduction countermeasure has been growing across the US. Minnesota does not currently permit SSCs by law, but recent interest from community leaders has led to the reconsideration of the use of SSCs on Minnesota roadways. T
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In this Transportation Research Synthesis (TRS), state-of-the-art practice of highway bridge maintenance painting using high-ratio calcium sulfonate alkyd (HRCSA) and hot water pressure wash (HWPW) is reviewed and different state DOTs are surveyed. In summary, low-toxic HRCSA causes less pollution, eliminates waiting time between layers of coatings
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This research will evaluate the effectiveness of the Electrical Resistivity, Seismic Refraction, and Cross-hole Tomography geophysical methods in Louisiana soils and provide detailed descriptions of each method, including their applicability to geotechnical engineering, pros and cons, and cost of each method and required equipment. This research wi
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The Colorado Department of Transportation (CDOT) funded this project to assess the current state-of-the-practice of EPDs in pavement material manufacturing; to educate stakeholders regarding pavement life cycle assessment (LCA) and EPDs; and to help develop protocols CDOT and pavement material producers can use to integrate EPDs that are uniquely s
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This project investigated current stripes removal techniques, and a laser system was assembled and tested in the field. Current removal techniques, such as flailing and water blasting, can cause damage to the road surface and leave ghost stripes that may distract drivers. A literature review and survey responses from various DOT districts have show
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