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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 2121 - 2140 of 35888 results
  • Update of Commercial Vessel Past Point Data for Designing Bridges Across Navigable Florida Waterway
    Update of Commercial Vessel Past Point Data for Designing Bridges Across Navigable Florida Waterway
    Consolazio, Gary R. ;
    Davidson, Michael T.
    2023-02-01 | PDF
    When designing a bridge that spans over a navigable waterway, the risk associated with potential vessel collisions must be evaluated to ensure that the structure possesses sufficient impact resistance. Typically, the probability-based risk assessment procedure specified by AASHTO is employed for this purpose. The procedure requires collection of da ...
  • Riprap Filters and Stability of RiprapCovered Slopes Technical Report
    Riprap Filters and Stability of Riprap-Covered Slopes: Technical Report
    Sfeir, Jerome ;
    Briaud, Jean-Louis
    2023-02-01 | PDF
    This research report documents the outcome of a study performed on riprap filters (granular and geosynthetic) and the stability of riprap-covered slopes. Erosion of the underlying soil through the riprap is likely to happen if there is a sufficient gap in grain size between the soil and the riprap. This gap is often the case, which is why a filter ...
  • The Economic and Societal Impact of Motor Vehicle Crashes 2019 Revised
    The Economic and Societal Impact of Motor Vehicle Crashes, 2019 (Revised)
    Blincoe, Lawrence J. ;
    Miller, Ted R
    2023-02-01 | PDF
    In 2019 there were 36,500 people killed, 4.5 million people injured, and 23 million vehicles damaged in motor vehicle crashes in the United States. The economic costs of these crashes totaled $340 billion, including lost productivity, medical, legal and court costs, emergency service, insurance administration, congestion, property damage, and workp ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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.
  • Implementation of the AASHTO MechanisticEmpirical Design Guide AASHTOWare Pavement ME Design for Pavement Rehabilitation
    Implementation of the AASHTO Mechanistic-Empirical Design Guide (AASHTOWare Pavement ME Design) for Pavement Rehabilitation
    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 ...
  • Guidelines for Incorporation of Cement Stabilized Reclaimed Base CSRB in Pavement Design
    Guidelines for Incorporation of Cement Stabilized Reclaimed Base (CSRB) in Pavement Design
    Kwon, Jayhyun ;
    Seo, Youngguk
    2023-02-01 | PDF
    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 ...
  • 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 ...
  • The Future of Working Away from Work and Daily Travel A Research Synthesis
    The Future of Working Away from Work and Daily Travel: A Research Synthesis
    Speroni, Samuel ;
    Taylor, Brian D.
    2023-02-01 | PDF
    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 ...
  • 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 ...
  • Minimum Intersection Illumination
    Minimum Intersection Illumination
    Hassan, Hany ;
    Abdu Kunnah, Hisham
    2023-02-01 | PDF
    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 ...
  • 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.
  • Best Practices for Maintenance of Control Access Fencing Project Capsule
    Best Practices for Maintenance of Control Access Fencing [Project Capsule]
    Moomen, Milhan
    ORCID ICON IMG
    2023-02-01 | PDF
    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.
  • 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 ...
  • Developing a Culvert Inspection Manual and Estimating Culverts Deterioration Curve Inspection Frequency and Service Life for UDOT
    Developing a Culvert Inspection Manual and Estimating Culverts’ Deterioration Curve, Inspection Frequency and Service Life for UDOT
    Mohammadi, Pouria ;
    Sherafat, Behnam
    2023-02-01 | PDF
    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 ...
  • Field Demonstration of an Innovative Box Beam Connection
    Field Demonstration of an Innovative Box Beam Connection
    Liu, Zhengyu ;
    Dahlberg, Justin
    2023-02-01 | PDF
    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 ...
  • Load Rating of GirderStringerFloorbeam Bridges
    Load Rating of Girder-Stringer-Floorbeam Bridges
    Henderson, R Craig ;
    Huff, Tim
    2023-01-31 | PDF
    The research described herein investigated the behavior and capacity of girder-string-floorbeam bridges by: • Conducting a literature review of the current state-of-practice and emerging research regarding the capacity and behavior of girder-stringer-floorbeam bridges; • Experimentally measuring strain at various locations and identifying character ...
  • Evaluating the Performance and Safety Effectiveness of Roundabouts An Update
    Evaluating the Performance and Safety Effectiveness of Roundabouts – An Update
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2023-01-30 | PDF
    The objective of this research was to evaluate driver behavior, safety benefits, operational and environmental benefits of roundabouts in Michigan. To that end, a list of all 180 known roundabouts was compiled from various sources. For comparison purposes, a group of reference intersections was also compiled that had similar traffic volume, roadway ...
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