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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.

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Showing 2561 - 2580 of 36873 results
  • Testing and Analysis of the Effects of Infiltrated Water and Ice on Friction Pendulum Bearings
    Testing and Analysis of the Effects of Infiltrated Water and Ice on Friction Pendulum Bearings
    Alvarado, Rolando Grijalva ;
    Ryan, Keri L.
    2023-02-17 | PDF
    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 ...
  • Options for the Future of State Funding for Transit Operations in California Informing the Future of the Transportation Development Act
    Options for the Future of State Funding for Transit Operations in California [Informing the Future of the Transportation Development Act]
    Gahbauer, John ;
    Matute, Juan
    2023-02-15 | PDF
    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 ...
  • Enhancing the Strategic Prioritization Process with Socioeconomic Geospatial Analysis
    Enhancing the Strategic Prioritization Process with Socioeconomic Geospatial Analysis
    Davis, Joy ;
    Coupet, Jason
    2023-02-15 | PDF
    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 ...
  • Shrinkage and Temperature Forces in Frame Piers Summary
    Shrinkage and Temperature Forces in Frame Piers [Summary]
    Shafei, Behrouz
    ORCID ICON IMG
    2023-02-01 | PDF
    Appropriate design strategies for frame piers can ensure their satisfactory performance against shrinkage and temperature effects while maintaining their construction cost advantages.
  • The Potential for RideMatching in Disadvantaged Communities
    The Potential for Ride-Matching in Disadvantaged Communities
    Giuliano, Genevieve ;
    Boarnet, Marlon
    2023-02-01 | PDF
    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 ...
  • Shrinkage and Temperature Forces in Frame Piers
    Shrinkage and Temperature Forces in Frame Piers
    Shafei, Behrouz ;
    Nelson, Al
    2023-02-01 | PDF
    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 ...
  • Improved Incident Response through Coordinated Interoperable Communications Project Capsule
    Improved Incident Response through Coordinated, Interoperable Communications [Project Capsule]
    Moomen, Milhan
    ORCID ICON IMG
    2023-02-01 | PDF
    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.
  • Minimum Intersection Illumination Tech Summary
    Minimum Intersection Illumination [Tech Summary]
    Hassan, Hany
    ORCID ICON IMG
    2023-02-01 | PDF
    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 ...
  • Asphalt RealTime Smoothness ARTS for Asphalt Paving
    Asphalt Real-Time Smoothness (ARTS) for Asphalt Paving
    Chang, George K ;
    Merritt, Dave
    2023-02-01 | PDF
    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 ...
  • Green Bike Lane Evaluation for Florida Pavements
    Green Bike Lane Evaluation for Florida Pavements
    Nyamuhokya, Tito ;
    Wilson, Bryan
    2023-02-01 | PDF
    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 ...
  • Development of a Geotechnical Asset Management Collection and Rating Program for Missouri Department of Transportation
    Development of a Geotechnical Asset Management Collection and Rating Program for Missouri Department of Transportation
    Mines, Aine E ;
    Beckstrand, Darren L.
    2023-02-01 | PDF
    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 ...
  • Develop Improved Methods for Eliminating Striping on Roadway Surfaces Final Report
    Develop Improved Methods for Eliminating Striping on Roadway Surfaces: Final Report
    Manzo, Maurizio ;
    Huang, Zhenhua
    2023-02-01 | PDF
    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 ...
  • Automated Extraction of Weather Variables from Imagery Summary
    Automated Extraction of Weather Variables from Imagery [Summary]
    National Center for Atmospheric Research (U.S.)  ...
    2023-02-01 | PDF
    Machine learning techniques that automatically identify winter road surface conditions in highway camera images have the potential to improve maintenance decision support systems.
  • Sustainable Waste Management through the Beneficial Use of Dredge Materials in Partnership with the City of Savannah
    Sustainable Waste Management through the Beneficial Use of Dredge Materials in Partnership with the City of Savannah
    Manoosingh, Celine ;
    Jeong, M. Myung
    2023-02-01 | PDF
    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 ...
  • Draft Report for Geoarchaeological Survey Methods for Enhanced Decision Making in the Ohio Department of Transportations Project Development Process
    Draft Report for Geoarchaeological Survey Methods for Enhanced Decision Making in the Ohio Department of Transportation’s Project Development Process
    Dam, Seth Van ;
    Laswell, Jeff
    2023-02-01 | PDF
    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. ...
  • Field Testing and LongTerm Monitoring of Selected HighMast Lighting Towers Phase 2
    Field Testing and Long-Term Monitoring of Selected High-Mast Lighting Towers (Phase 2)
    Lloyd, Jason B ;
    Connor, Robert J.
    2023-02-01 | PDF
    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 ...
  • Temperature Effects in MatchCast Segmental Bridge Construction
    Temperature Effects in Match-Cast Segmental Bridge Construction
    Grisales, Alvaro Rafael Mendoza ;
    Riding, Kyle A
    2023-02-01 | PDF
    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 ...
  • Implementation of the AASHTO MechanisticEmpirical Design Guide AASHTOWare Pavement ME Design for Pavement Rehabilitation Technical Summary
    Implementation of the AASHTO Mechanistic-Empirical Design Guide (AASHTOWare Pavement ME Design) for Pavement Rehabilitation [Technical Summary]
    Islam, Shuvo ;
    Hossain, Mustaque
    2023-02-01 | PDF
    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 ...
  • NonTraffic Surveillance Fatality and Injury Statistics in NonTraffic Crashes 2016 to 2020 Revised Traffic Safety Facts
    Non-Traffic Surveillance: Fatality and Injury Statistics in Non-Traffic Crashes, 2016 to 2020 (Revised) [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-02-01 | PDF
    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 ...
  • Development of Crash Modification Factors CMFs for Utah Intersections
    Development of Crash Modification Factors (CMFs) for Utah Intersections
    Gong, Yaobang ;
    Yang, Xianfeng Terry
    2023-02-01 | PDF
    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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