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 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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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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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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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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Appropriate design strategies for frame piers can ensure their satisfactory performance against shrinkage and temperature effects while maintaining their construction cost advantages.
The mobility constraints for low-income households are well known. Limited or no access to a private vehicle and often poor quality transit access result in shorter trips, slower travel speeds, and overall less travel. New mobility services that fill the gap between vehicle ownership and transit can potentially provide better mobility options for t
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Culverts are among the most important assets of state transportation departments. As culvert inspection and maintenance are critical to the safe operation of transportation infrastructure systems and preventing injuries, human life losses, and heavy financial losses, they should be inspected and maintained regularly. Several state DOTs and the Amer
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Shrinkage and temperature forces are known to have short- and long-term effects on both the superstructures and substructures of bridges. In the substructure, such effects are more pronounced if frame piers are used, given their volumetric change is often restrained. The main objective of this research was to investigate the forces developed in fra
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The objectives of this study are to: (1) carry out an operational needs assessment and a performance evaluation of the state’s TIM; (2) perform a functional analysis of the Mutualink system; and (3) carry out a benefit cost analysis of integrating Mutualink into the state’s TMC.
The primary objective of this project is to examine whether Louisiana has a traffic safety problem due to lack of lighting at its intersections, particularly at roundabouts and stop-controlled intersections, at rural and suburban areas. Underlying this objective, this research aims to undertake a nationwide survey of state DOTs to document lessons
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Real-Time Smoothness (RTS) measures pavement surface profiles during paving using sensors mounted on the back of a paver. The Federal Highway Administration (FHWA) has supported implementing RTS technology for concrete pavements through the SHRP2 Solutions program since 2014. Its study indicated that RTS technology's real-time diagnosis allows chan
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The objectives of this project were to identify the causes of the premature failure of Florida's green-colored pavement markings (GCPMs) and to produce guidelines and improved specifications for the future installation and testing of new GCPM materials. The researchers reviewed relevant literature, interviewed contractors and vendors, visited exist
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Asset Management (GAM)program through close collaboration with MoDOT geotechnical engineers and MoDOT’s IT group. The team adjusted published and commonly accepted categories from state and federal GAM inventory and rating approaches to match conditions specific to Missouri. The GAM program compiles condition and risk assessment for six asset types
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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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National Center for Atmospheric Research (U.S.)
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2023-02-01
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PDF
Machine learning techniques that automatically identify winter road surface conditions in highway camera images have the potential to improve maintenance decision support systems.
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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The Ohio Department of Transportation (ODOT) Office of Statewide Planning & Research, Research Section contracted Gray & Pape, Inc., to conduct research to provide a comparison of geophysical survey methods, instruments, equipment, and associated software to determine what instrument or combination of instruments works best in different scenarios.
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Phase 2 monitoring was carried out continuously for an additional 18 months. Identical to Phase 1, Phase 2 instrumentation included an ice sensor, anemometer for wind speed and direction, thermocouple for temperature, and strain gages. In this way, the research team was able to determine what the structural response to the large-amplitude events we
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Precast segmental bridge construction has provided a versatile, efficient, and cost-effective method for constructing bridges. Bowing distortion issues can however occur during segment fabrication, causing segments to have slightly different lengths in the center than outside edges. This occurs when the match-cast segment bows as a result of the he
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