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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 3301 - 3320 of 36873 results
  • Meaningful Performance Measures for the Vehicle Size and Weight Programs That Are Useful for All Stakeholders Investigating of Meaningful Performance Measures for Vehicle Size and Weight Enforcement
    Meaningful Performance Measures for the Vehicle Size and Weight Programs That Are Useful for All Stakeholders: Investigating of Meaningful Performance Measures for Vehicle Size and Weight Enforcement
    Gross, Perry ;
    Lawson, Michael
    2022-03-01 | PDF
    The research project to develop meaningful performance measures useful to those engaged in the Nevada vehicle size and weight enforcement program yielded a much better understanding of the relationships, obstacles, and opportunities for improvement in this vital program area. This report documents those findings. The most significant discovery was ...
  • Examining the Effects of Precision Scheduled Railroading on Intercity Passenger and HighSpeed Rail Service
    Examining the Effects of Precision Scheduled Railroading on Intercity Passenger and High-Speed Rail Service
    Green, John G ;
    Miller, Francis J
    2022-03-01 | PDF
    More than just scheduling terminal-to-terminal trips for trains, “Precision Scheduled Railroading” (PSR) creates entire point-to-point trip plans for individual railroad shipments. Since precision execution was first put into practice, the benefits to shipment arrival reliability and to freight railroads’ profitability have been demonstrated by its ...
  • Synthesis Study Repair and Durability of FireDamaged Prestressed Concrete Bridge Girders
    Synthesis Study: Repair and Durability of Fire-Damaged Prestressed Concrete Bridge Girders
    Tseng, Tzu-Chun ;
    Varma, Amit H.
    2022-03-01 | PDF
    Recent research results from INDOT research project SPR-4221 indicate that the damage to prestressed concrete bridge girders from an intense hydrocarbon fire is limited to concrete material degradation up to a depth of 1 inch from the surface. Additionally, concrete cracking and spalling occur in the fire-damaged region, but the structural strength ...
  • Connecticut Historic Bridge Inventory Update Tasks 13 Final Report
    Connecticut Historic Bridge Inventory Update – Tasks 1-3 Final Report
    McMillan, Mark
    2022-03-01 | PDF
    The overall objective of this project is to update the Inventory of historic bridges within CTDOT’s state-maintained roadway network. It will identify historic bridges within the network and categorize the historic significance of all the bridges as eligible or not eligible for the National Register of Historic Places. The Inventory Update will als ...
  • US Department of Transportation Learning Agenda
    U.S. Department of Transportation Learning Agenda
    United States. Department of Transportation  ...
    2022-03-01 | PDF
    In accordance with the Foundations for Evidence-Based Policymaking Act of 2018, Public Law No. 115-435 (Evidence Act) and Office of Management and Budget (OMB) Memorandum M-19-23, the United States Department of Transportation (DOT or the Department) is pleased to present DOT’s Learning Agenda, which lays out the Department’s plans for identifying ...
  • Fill Materials at Integral End Bents
    Fill Materials at Integral End Bents
    Sun, Charlie ;
    Beckham, Tony
    2022-03-01 | PDF
    Jointless bridge designs have become increasingly popular due to their low construction and maintenance costs. But this design carries risks. Most notably, integral end bents can be displaced and undergo settlement due to soil movement in embankments and loads carried by the superstructure. In response, the Kentucky Transportation Cabinet (KYTC) de ...
  • Telecommuting During COVID19 How Does It Shape the Future Workplace and Workforce
    Telecommuting During COVID-19: How Does It Shape the Future Workplace and Workforce?
    Qian, Xinyi ;
    Linscheid, Neil
    2022-03-01 | PDF
    The objective of this research is to assess the impact of temporarily shifting the workforce to telecommuting on: (1) workplace policy changes, employee support, and future telecommuting plans, (2) employees’ experience of telecommuting during COVID-19 and forecast of future telecommuting, and (3) differences among geographic areas, life circumstan ...
  • Identification of Locations and Causes of Unreliable Travel Times on Virginia Freeways
    Identification of Locations and Causes of Unreliable Travel Times on Virginia Freeways
    Lan, Chien-Lun ;
    Venkatanarayana, Ramkumar
    2022-03-01 | PDF
    Travel time unreliability on roadway networks and its mitigation continue to be increasingly strong focus areas for many transportation agencies. Although the transportation agencies and motorists are often interested in improving corridor and network travel time reliability, the predominant state-of-the-art methods available to practitioners focus ...
  • Shrinkage Induced Deformations in Steel Bridges Made Composite With Concrete Deck Slabs
    Shrinkage Induced Deformations in Steel Bridges Made Composite With Concrete Deck Slabs
    Russell, Bruce W ;
    Acheli, Alla Eddine
    2022-03-01 | PDF
    Concrete bridge deck cast upon steel girders form a composite steel-concrete bridge. Volume changes in the concrete caused by shrinkage, temperature or other effects can alter the finished elevations of the bridge decks. Some of the state’s newly constructed bridges have experienced downward deflecting decks, causing uneven riding surfaces. It has ...
  • Optimizing Multimodal Transportation Access to Support Commuting Among LowIncome Transit Riders with Social Distancing
    Optimizing Multimodal Transportation Access to Support Commuting Among Low-Income Transit Riders with Social Distancing
    Chandra, Shailesh ;
    Mishra, Vivek
    2022-03-01 | PDF
    During the COVID-19 pandemic, LA Metro has encouraged social distancing among passengers—especially at stations of high-demand routes—and has increased fixed-route transit (FRT) services. However, potential impacts of social distancing on the performance of FRT services remain mostly unknown. This research evaluates the accessibility of FRT buses w ...
  • Use of Smart Rocks to Improve Rock Slope Design
    Use of Smart Rocks to Improve Rock Slope Design
    Benoit, Jean ;
    Souza, Bruma
    2022-03-01 | PDF
    Rock slopes pose a hazard to the traveling public when weathering processes dislodge portions of the slope that can fall into the road. Both the design of new rock slopes and the hazard assessment of existing rock slopes need improvement to increase safety against rockfall, construct better engineered slopes and reduce short-and long-term maintenan ...
  • Quality Management of Cracking Distress Survey in Flexible Pavements Using LTRC Digital Highway Data Vehicle
    Quality Management of Cracking Distress Survey in Flexible Pavements Using LTRC Digital Highway Data Vehicle
    Wu, Zhong ;
    Emtiaz, Mostafiz
    2022-03-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) began to collect its Pavement Management System (LA-PMS)’s pavement condition data using a vendor’s 3D automatic system in 2017. For each 0.1-mile subsection on a flexible pavement, the vendor’s 3D automated cracking data reported in LA-PMS consists of various cracking amounts in ter ...
  • A Literature Analysis to Determine Optimal Wildlife Crossing Structure Size
    A Literature Analysis to Determine Optimal Wildlife Crossing Structure Size
    Basting, Pat ;
    Bishton, Keith
    2022-03-01 | PDF
    The Literature Analysis to Determine Optimal Wildlife Crossing Structure Size Study (Study) emerged from Colorado Department of Transportation’s (CDOT’s) desire to determine if there is a point of diminishing return of effectiveness based on target species success rates when it comes to sizing highway wildlife passages. This Study’s objectives are ...
  • Evaluation of NonRegulated Portable Moisture Density Gauge
    Evaluation of Non-Regulated Portable Moisture Density Gauge
    Serio, Melissa
    2022-03-01 | PDF
    Standard portable nuclear moisture-density gauges are very accurate and easy to operate for determining density and moisture content of soils as well as other construction materials. Unfortunately, the size of the radioactive sources used in the standard nuclear gauges are such that they are regulated by the Nuclear Regulatory Commission and in Iow ...
  • RealTime Network Assessment and Updating Using VehicleLocating Data
    Real-Time Network Assessment and Updating Using Vehicle-Locating Data
    Tien, Iris ;
    Roberts, Zachary
    2022-03-01 | PDF
    This project explores the ability to use vehicle-locating data to assess the state of the road network, including identifying road blockages along different segments of the transportation system. The project utilizes the mobile sources of Georgia Department of Transportation (GDOT) vehicles and their associated vehicle-tracking information to infer ...
  • Air Quality Dispersion Model Research AERMOD RLINEXT Source Type Brief
    Air Quality Dispersion Model Research: AERMOD RLINE/XT Source Type [Brief]
    AECOM
    2022-03-01 | PDF
    This report is one of a group of research reports sponsored by the Federal Highway Administration (FHWA) through State Departments of Transportation (DOTs) in a partnership to test two new source types within the AERMOD modeling regime (Version 21112): RLINE and RLINEXT. The Environmental Protection Agency (EPA) published a final rule revising the ...
  • Pavement Performance Curves Modeling Pavement Deterioration for SCDOT
    Pavement Performance Curves: Modeling Pavement Deterioration for SCDOT
    Huynh, Nathan ;
    Gassman, Sarah
    2022-02-28 | PDF
    The current SCDOT pavement performance models were formulated in 1989 by PMS Inc. (now known as Stantec) with assistance from SCDOT personnel, and they were based on engineering experience of pavement performance in South Carolina. Since their initial development, the parameters of the adopted sigmoidal, or S-shaped, function have not been updated. ...
  • A Review of Floridas FC5 Raveling Condition Assessment and Measurement Methods
    A Review of Florida's FC-5 Raveling Condition Assessment and Measurement Methods
    Tsai, Yichang (James) ;
    Hsieh, Yung-An
    2022-02-28 | PDF
    While open-graded friction course (OGFC) mixtures, called FC-5 in the Florida Department of Transportation (FDOT), provide several safety benefits, their lives are limited to approximately 14 years on average in Florida. The reduced life is generally due to raveling, which rapidly deteriorates once initiated. In FDOT, raveling is rolled up into the ...
  • MultiScale MultiSeason LandBased Erosion Modeling and Monitoring for Infrastructure Management
    Multi-Scale Multi-Season Land-Based Erosion Modeling and Monitoring for Infrastructure Management
    Wang, Bin ;
    Snow, Christopher
    2022-02-25 | PDF
    In the New England region, roadways located within “erosion-prone zones” have been the main sources of erosion-induced road damage, particularly when major storms occur. With recent and continuing climate change influencing weather patterns (specifically causing an increase in high-intensity rainfall events, and rainfall events following snow event ...
  • Calibration of HSM Predictive Methods on State and Local Rural Highways
    Calibration of HSM Predictive Methods on State and Local Rural Highways
    Qin, Xiao ;
    Chen, Zhi
    2022-02-22 | PDF
    Performance-based safety goals and objectives are more attainable with the use of the Highway Safety Manual (HSM). However, the safety performance functions (SPFs) in the HSM are not accurate because they are not calibrated to local conditions. Additionally, each SPF and crash modification factor (CMF) assumes a set of base site conditions which mi ...
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