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 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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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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The AASHTOWare Pavement ME Design (PMED) is a novel design method for new and rehabilitated pavement designs based on mechanistic-empirical design principles. The design process includes several empirical models calibrated with pavement performance data from pavement sections throughout the United States. Improved accuracy of the design process req
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2023-02-01
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Based on the Non-Traffic Surveillance (NTS) system, an estimated average of 2,449 people were killed each year in non-traffic motor vehicle crashes during the 5-year period from 2016 to 2020. About a third (35%) of those people killed were nonoccupants such as pedestrians and bicyclists. Additionally, on average, an estimated 86,920 people were inj
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This research project aims at developing state-specific CMFs at intersections in Utah to quantify the safety impact of the countermeasures. Considering the research needs, data availability, and suggestions from the Technical Advisory Committee, the CMFs of four left-turn-phasing-related treatments, namely converting both-roadway permissive to one-
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Construction and concrete production are time-sensitive and fast-paced; as such, it is crucial to monitor the in-place strength development of concrete structures in real-time. Existing concrete strength testing methods, such as the traditional hydraulic compression method specified by ASTM C 39 and the maturity method specified by ASTM C 1074, are
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Invasion by exotic-annual grasses such as cheatgrass is impacting semiarid rangelands and especially transportation corridors, where it causes increased wildfire and many other environmental issues. Methods of reducing exotic annual grasses and restoring native perennials are needed, particularly testing of their intended target or unintended, non-
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With over a decade of crash data available since the beginning of flashing yellow arrow (FYA) use, MoDOT decided to objectively investigate the safety performance of the system. Additionally, they wished to have an accurate inventory of all FYA installations statewide, and a determination of the benefit-cost ratio of the signal system. A virtual su
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GDOT is in the process of implementing an updated Mechanistic-Empirical Pavement Design Guide (MEPDG). To support this implementation, a research study was conducted to calibrate the national performance models for local conditions. However, reliable calibration coefficients could not be derived for semi-rigid pavements due to the lack of sufficien
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The objective of this project was to demonstrate the field implementation of an innovative longitudinal joint design developed during a previous phase of research. To achieve this objective, a yet-to-be-constructed box girder bridge in Washington County, Iowa, was selected to demonstrate the construction and performance of the joint. In order to ev
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Numerous prior studies indicated that street lighting improves nighttime traffic safety. However, lighting at unsignalized intersections (e.g., stop-controlled intersections and roundabouts) is not mandatory in some states such as Louisiana. This study aimed to examine whether Louisiana has traffic safety problems due to lack of lighting at its rur
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Eastern Massasaugas (Sistrurus catenatus) endangered in Ohio and federally threatened. Current approved survey methods involve corrugated tin surveys supplemented by visual encounter surveys. While effective, these traditional methods have low detection rates and require intensive field effort which can complicate environmental reviews of project i
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This research synthesizes literature on the relationship between working from home and travel. This relationship is a pertinent one because transportation planners and policymakers have long hoped that increased remote work, sometimes called telecommuting or telework, will reduce driving, traffic congestion, and vehicle emissions. This question is
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The objectives of this project are to: (1) determine the best maintenance practices of access control fencing; (2) develop an informational guide for access control fencing maintenance that may aid in updating existing fencing policy; and (3) determine alternative fencing and other practices to lower maintenance costs.
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