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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 1481 - 1500 of 35452 results
  • Determine the Adequacy of Installation of Existing Roadside Barriers on HighSpeed Roadways Summary Report
    Determine the Adequacy of Installation of Existing Roadside Barriers on High-Speed Roadways [Summary Report]
    Bligh, Roger ;
    Chamargore, Sonal
    2023-08-31 | PDF
    Posted speed limits on Texas roadways have increased in recent years. Texas now has many miles of roadways posted at speeds of 75 mph and above. Barrier systems (e.g., guard fence, median barriers, and bridge rails) are currently tested and evaluated at a design impact speed of 62 mph. The performance limits of existing barriers are not known. Some ...
  • Traffic Control Device Analysis Testing and Evaluation Program Project Summary
    Traffic Control Device Analysis, Testing, and Evaluation Program [Project Summary]
    Finley, Melisa D. ;
    Habermann, John
    2023-08-31 | PDF
    Evaluating the numerous types of traffic control devices (TCDs) newly available and installed across Texas roadways is a key for the Texas Department of Transportation (TxDOT) to maintain roadway safety and proper performance of TCDs. Evaluations are also needed in order to cost-effectively implement new devices and technologies for continual impro ...
  • Implementation of Retroreflective Pavement Markers RPMs in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations Project Summary
    Implementation of Retroreflective Pavement Markers (RPMs) in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations [Project Summary]
    Ferron, Raissa ;
    Al-Amin, Md
    2023-08-31 | PDF
    This implementation project aimed to validate the results of a previous project (0-5665) by determining the rumble strip depth that can provide adequate protection to the markers while also still being visible to road users. The research team identified additional sites to deploy embedded markers in rumble strips. Two marker types (low profile mark ...
  • Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures Project Summary
    Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures [Project Summary]
    Kovar, James C. ;
    Bligh, Roger
    2023-08-31 | PDF
    The objective of this project was to develop a median opening protection system (MOPS) suitable for implementation in sloped medians between parallel bridges. One primary goal was to use currently available technologies to speed implementation. The MOPS was intended to prevent motorists from experiencing these roadway departure crashes between para ...
  • Automated IDEAL Cracking and Rutting Tests Project Summary
    Automated IDEAL Cracking and Rutting Tests [Project Summary]
    Zhou, Fujie ;
    Roa, Jorge
    2023-08-31 | PDF
    The researchers developed the Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE), shown in Figure 1. The AMAZE includes five units: • An air voids measurement unit. • A specimen storage unit. • Two temperature conditioning units, one for room temperature and the other for high temperature (e.g., 50 °C). • A material testing loa ...
  • Develop Standardized Operational Evaluation of WrongWay Driving Detection Technologies Project Summary
    Develop Standardized Operational Evaluation of Wrong-Way Driving Detection Technologies [Project Summary]
    Finley, Melisa D. ;
    Venglar, Steven P.
    2023-08-31 | PDF
    From 2010 to 2019, approximately 1700 wrong-way driving (WWD) crashes occurred in Texas on controlled-access highways (e.g., freeways and interstates). On average, about 170 WWD crashes occurred each year, and 10 percent resulted in a fatality. To reduce the number of wrong-way (WW) maneuvers and associated crashes on Texas freeways, the Texas Depa ...
  • 57008 Implementation of Electrical Resistivity Imaging Manual
    5-7008: Implementation of Electrical Resistivity Imaging Manual
    Shahandashti, Mohsen ;
    Hossain, Sahadat
    2023-08-31 | PDF
    Texas Department of Transportation (TxDOT) annually encounters a substantial number of claims and change orders that have a detrimental effect on project costs and schedules. State Departments of Transportation (DOTs) spend approximately $10 million annually on geotechnical-related change orders, accounting for about 7% of the total expenditures as ...
  • 07146 Develop Guidance for Local Government Building Codes for Bridges
    0-7146: Develop Guidance for Local Government Building Codes for Bridges
    Shahandashti, Mohsen ;
    Chao, Shih-Ho (Simon)
    2023-08-31 | PDF
    The design, construction, and maintenance of off-system bridges vary across local governments (cities and counties), often resulting in inferior performance compared to bridges managed by state highway agencies. Limited knowledge of local government practices hinders understanding of the factors contributing to these deficiencies and poses challeng ...
  • Illinois Highway Materials Sustainability Efforts 2022
    Illinois Highway Materials Sustainability Efforts 2022
    Morse, Kelly L.
    2023-08-29 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Volume 1 Urban Driver Mental Frameworks and Implications
    Volume 1: Urban Driver Mental Frameworks and Implications
    Eluru, Naveen ;
    Tice, Patricia
    2023-08-23 | PDF
    Over the last 85 years, engineers and researchers have tweaked and analyzed every minute detail of roadway design with one goal: optimizing vehicular speed. Although the industry has been looking seriously at design for other modes since the late 1980’s, the vast majority of the money and energy has been poured into examining every nuance and detai ...
  • Guidelines to Enhance the Constructability of Diverse Modern and Unconventional Intersections and Interchanges DMUII
    Guidelines to Enhance the Constructability of Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII)
    Rasdorf, William ;
    Rouphail, Nagui
    2023-08-15 | PDF
    The current focus on promoting sustainability in the United States transportation infrastructure has led to adopting Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII) to improve traffic flow while ensuring safety. However, the adoption of DMUII designs presents challenges, including a learning curve for the public and contr ...
  • Truck Platooning Effects on Girder Bridges Phase IIService
    Truck Platooning Effects on Girder Bridges: Phase II-Service
    Steelman, Joshua S. ;
    Puckett, Jay A.
    2023-08-11 | PDF
    Truck platooning—wirelessly linking two or more trucks to travel in a closely spaced convoy—is federally promoted to save fuel, improve the environment, and improve traffic operations. Platooning places trucks much closer than current design codes anticipate. While this strategy can provide higher fuel efficiency, it also can potentially overload s ...
  • Economic Contribution of Rail in North Carolina
    Economic Contribution of Rail in North Carolina
    Brock, Tim ;
    Hassett, Ryan
    2023-08-11 | PDF
    This research effort is part of a collaborative research project between the North Carolina Department of Transportation (NCDOT) and North Carolina State University’s (NCSU’s) Institute for Transportation Research and Education (ITRE). NCDOT Rail Division's mission is the “…safe and efficient movement of people and goods on North Carolina's railroa ...
  • Measuring and Improving the Effectiveness of ADOTs Employee Learning and Development Program
    Measuring and Improving the Effectiveness of ADOT’s Employee Learning and Development Program
    Perry, MacKenna ;
    Manseth, Kristi
    2023-08-09 | PDF
    Arizona Department of Transportation's (ADOT) Employee and Business Development (EBD) office develops and provides required and elective training to ADOT staff and to external stakeholders. For its training programs, EBD’s objectives are to: (1) Improve employee competence and performance to enhance the performance of the agency; (2) Improve employ ...
  • Microbial Concrete Sealer
    Microbial Concrete Sealer
    El-Hajj, Bashear ;
    Pitell, Sarah
    2023-08-05 | PDF
    Portland Cement Concrete (PCC) is the most widely used construction material due to its versatility, durability, and economy (Mindess et al. 2003). However, PCC is also a quasi-brittle material that has low tensile strength and ductility, as well as weak resistance to the propagation of cracks. Also, problems related to shrinkage, durability and wo ...
  • MultiModal Intelligent Traffic Signal System MMITSS Phase III Extension for Additional Enhancements
    Multi-Modal Intelligent Traffic Signal System (MMITSS) Phase III Extension for Additional Enhancements
    Zhou, Kun ;
    Gan, Qijian
    2023-08-03 | PDF
    In the California Connected Vehicle (CV) Testbed, four intersections have been instrumented with NoTraffic sensors for more accurate detection of multi-modal traffic within the intersection conflict area, and six operational High Intensity Activated CrossWalK (HAWK) signals have been installed to enhance the safety for pedestrians and cyclists whil ...
  • Evaluation of Jobsite Cylinder Curing Practices for the Alabama Concrete Industry
    Evaluation of Jobsite Cylinder Curing Practices for the Alabama Concrete Industry
    White, Jackson L ;
    Fleming, Kyle R
    2023-08-01 | PDF
    The effect of initial curing temperature and duration on the 28-day compressive strength of concrete was experimentally evaluated. Concrete cylinders were cured at six initial curing temperatures (60, 68, 78, 84, 90, and 100 ⁰F) for three different initial curing durations (24, 48, and 72 hours). After the initial curing duration was complete, the ...
  • Measuring Transport Properties of Portland Cement Concrete Using Electrical Resistivity
    Measuring Transport Properties of Portland Cement Concrete Using Electrical Resistivity
    Hartell, Julie Ann ;
    O’Reilly, Matthew
    2023-08-01 | PDF
    Although classification tables based on susceptibility to chloride ion permeability are recommended in AASHTO T 358, the classification levels with respect to durability parameters may or may not be adequate. Of interest for concrete pavement performance, this study verifies the recommended classification levels against standard durability testing ...
  • Centering the Margins The Transportation Experience of Underserved Communities
    Centering the Margins: The Transportation Experience of Underserved Communities
    Fan, Yingling ;
    Greenberg, Gillian
    2023-08-01 | PDF
    Transportation systems, as integral parts of human settlements, reflect the societal structures and cultural ideologies influenced predominantly by the dominant race or class. In the absence of prioritizing the transportation needs of underserved communities, transportation systems may perpetuate systematic inequities. This study aims to address th ...
  • Optimizing Reinforcing Steel in 12In and 13In Continuously Reinforced Concrete Pavement CRCP
    Optimizing Reinforcing Steel in 12-In and 13-In Continuously Reinforced Concrete Pavement (CRCP)
    Lee, Heejun ;
    Koirala, Niwesh
    2023-08-01 | PDF
    The performance of continuously reinforced concrete pavement (CRCP) in Texas has been excellent. However, truck traffic in Texas has been increasing, which required thicker slabs. Since TxDOT placed steel at the mid-depth of the slab, the use of thicker slabs increased the distance between top of the slab and longitudinal steel. This increase resul ...
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