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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 5501 - 5520 of 36022 results
  • Probability of Detection Study for Visual Inspection of Steel Bridges Volume 1 Executive Summary
    Probability of Detection Study for Visual Inspection of Steel Bridges: Volume 1— Executive Summary
    Campbell, Leslie E. ;
    Snyder, Luke R.
    2019-08-01 | PDF
    An inspector’s ability to correctly identify surface and internal defects in steel bridge components is critical to protecting public safety. Ensuring that inspectors are properly trained and adequately equipped to detect these defects in locations that are difficult to access and/or in unfavorable environmental conditions must be a high priority. ...
  • Investigation of Low Visibility Related Crashes in Florida Summary
    Investigation of Low Visibility Related Crashes in Florida [Summary]
    Lee, Jaeyoung
    ORCID ICON IMG
    2019-08-01 | PDF
    Researchers from the University of Central Florida developed a methodology for identifying areas of increased fog and/or smoke crashes in Florida. They focused on these areas to develop a more detailed map of specific hotpots.
  • Traffic Safety Culture A Primer for Traffic Safety Practitioners
    Traffic Safety Culture: A Primer for Traffic Safety Practitioners
    Ward, Nicholas J. ;
    Otto, Jay
    2019-08-01 | PDF
    There is growing interest in “traffic safety culture” (TSC) as a key factor to manage and sustain safe roadway transportation systems, especially as more jurisdictions adopt targets of zero traffic fatalities and serious injuries. However, the theory, terminology, and methods involved in addressing TSC come from human and social science disciplines ...
  • Quantifying the Performance of LowNoise Transverse Rumble Strips
    Quantifying the Performance of Low-Noise Transverse Rumble Strips
    Hurwitz, David S. ;
    Horne, Dylan
    2019-08-01 | PDF
    Transverse rumble strips (TRS) generate noise and vibration to alert drivers when they are approaching an intersection with traffic control, e.g. stop signs. TRS have been shown to reduce crashes up to 30% but have noise concerns (Finley et al., 2007). This study evaluated the feasibility of using shallow, epoxy filled TRS (EFTRS) as a substitute t ...
  • Maintenance Strategies for OpenGraded Friction Course OGFC
    Maintenance Strategies for Open-Graded Friction Course (OGFC)
    Huang, Boashan ;
    Shu, Xiang
    2019-08-01 | PDF
    Since 1983, TDOT has absorbed approximately 3,500 miles of former county roads into its system. The composition and structural capacity of a large portion of these road ways is unknown, except for new overlays that have been constructed since that time. The objective of this study is to utilize ground penetrating radar (GPR)technology to determine ...
  • Back of Queue Warning and Critical Information Delivery to Motorists
    Back of Queue Warning and Critical Information Delivery to Motorists
    Li, Lingxi ;
    Chen, Yaobin
    2019-08-01 | PDF
    Back-of-queue crashes are one of the main sources for fatal accidents on U.S. highways. A variety of factors including low visibility, slippery road surface, and driver distraction/drowsiness during highway cruising, all contribute to this type of fatal crashes. Thus, it is very important to improve the driver’s situational awareness before they ap ...
  • Remote Controlled Hydrographic Survey System
    Remote Controlled Hydrographic Survey System
    Nicholson, Kent
    2019-08-01 | PDF
    The purpose of this project was to investigate the potential for collecting and using engineering survey accurate data from a remote controlled (unmanned) platform equipped with a system of advanced survey technologies for hydrographic and bridge scour evaluations. The primary interests in investigating this hydrographic scanning technology is to o ...
  • Evaluating Integrated Roadside Vegetation Management IRVM Techniques to Improve Pollinator Habitat
    Evaluating Integrated Roadside Vegetation Management (IRVM) Techniques to Improve Pollinator Habitat
    Kuder, Lisa
    2019-08-01 | PDF
    In an effort to improve roadside habitat for pollinators this three-year field study had two main goals: to determine which vegetation management tactics best maximize quality floral resources for pollinators in the Northeast, and to assess how those different regimes affect regional bee populations. The findings show that managing roadsides via se ...
  • The Air Quality and Health Impacts of Projected LongHaul Truck and Rail Freight Transportation in the United States in 2050
    The Air Quality and Health Impacts of Projected Long-Haul Truck and Rail Freight Transportation in the United States in 2050
    Pan, Shuai ;
    Gao, H. Oliver
    2019-08-01 | PDF
    Diesel emissions from freight transportation activities are a key threat to public health. This study examined the air quality and public health impacts of projected freight-related emissions in 2050 over the continental United States. Three emission scenarios were considered: (1) a projected business-as-usual socioeconomic growth with freight flee ...
  • Develop and Implement a Freeze Thaw Model Based Seasonal Load Restriction Decision Support Tool
    Develop and Implement a Freeze Thaw Model Based Seasonal Load Restriction Decision Support Tool
    Liu, Zhen (Leo) ;
    Vitton, Stanley
    2019-08-01 | PDF
    This report summarizes a study on the development and implementation of a freeze thaw model based Seasonal Load Restriction (SLR) decision support tool. A multivariable prediction approach for freezing and thawing depths were proposed. The approach was implemented with input from weather data and Road Weather Information System (RWIS) data, leading ...
  • Evaluation of Skid Resistance of Idaho Pavements at Different Speeds
    Evaluation of Skid Resistance of Idaho Pavements at Different Speeds
    Kassem, Emad ;
    Nielsen, Richard
    2019-08-01 | PDF
    Adequate skid resistance is essential component of road safety. Various transportation agencies measure the skid number using a locked-wheel skid trailer at a reference speed (e.g., 40 mph). In many cases the skid number is measured at lower speeds due to state speed limits, geometry of roads and size of skid truck. It is well established that the ...
  • Developing a Transportation Emissions and Health Database
    Developing a Transportation, Emissions, and Health Database
    Birt, Andrew ;
    Seedah, Dan
    2019-08-01 | PDF
    The CARTEEH datahub addresses the need for a systematic, cross-disciplinary approach to understanding and integrating transportation and health datasets. This report documents the development of the datahub and includes a technical review of off-the-shelf software solutions for implementing a datahub, as well as a description of high-level goals de ...
  • Value of Implementation TxDOT Project 5665601 Verification of ASR Resistance Property of the Commonly Used Concrete Mix Designs by the Precast Industries in Texas
    Value of Implementation: TxDOT Project 5-6656-01, Verification of ASR Resistance Property of the Commonly Used Concrete Mix Designs by the Precast Industries in Texas
    Mukhopadhyay, Anol
    2019-08-01 | PDF
    The Value of Implementation (VoI) analysis is determined at the end of this project to identify appropriate qualitative and economic benefits. Table 1 summarizes the benefit areas determined in this project, followed by a brief discussion for each selected benefit.
  • 360Degree Point Cloud Technology for Building Management Transportation Research Synthesis
    360-Degree Point Cloud Technology for Building Management: Transportation Research Synthesis
    Lovelace, Barritt
    2019-08-01 | PDF
    The Building Services Section (BSS) owns and operates 888 individual buildings at 269 sites throughout Minnesota. BSS is exploring ways collect, process and communicate as-built data for their sites and buildings with imaging and scanning technology. The data can be collected with spherical cameras, handheld cameras, laser scanners and drones or an ...
  • Innovative Coating Removal Techniques for Coated Bridge Steel
    Innovative Coating Removal Techniques for Coated Bridge Steel
    Fitz-Gerald, James M ;
    Agnew, Sean R
    2019-08-01 | PDF
    The purpose of this study was to determine if the use of a laser ablation coating removal (LACR) system would provide the Virginia Department of Transportation (VDOT) with an acceptable new alternative for removing existing coatings. In this study, the LACR process was documented in the laboratory and in the field to determine the feasibility of im ...
  • LifeCycle Civil Integrated Management CIM Advancements in Preliminary Design BIM for Infrastructure
    Life-Cycle Civil Integrated Management (CIM) Advancements in Preliminary Design BIM for Infrastructure
    Trboyevich, Chris ;
    Lovel, Richard
    2019-08-01 | PDF
    This study is an evolution of the Minnesota Local Road Research Board’s sponsored research Modernizing Road Construction Plans and Documentation (Iowa State University, September 2016). Where previous studies provided high-level practices for transportation, this research examines advances in preliminary (0-30%) design tools and methods that bring ...
  • Women in the Arizona Department of Transportation Workforce
    Women in the Arizona Department of Transportation Workforce
    Stevens, Sally ;
    Davis, Monica
    2019-08-01 | PDF
    The study examined the role and experience of women employed in the Arizona Department of Transportation (ADOT) workforce. The research was designed to help ADOT better understand the factors that both promote and impede women’s employment at ADOT, especially in the job categories for which the department has not achieved parity and for those that ...
  • Public Transit in America 2017 Observations from the 2017 National Household Travel Survey
    Public Transit in America 2017: Observations from the 2017 National Household Travel Survey
    Godfrey, Jodi ;
    Polzin, Steven E.
    2019-08-01 | PDF
    This report begins with a discussion of how the NHTS survey has changed and describes the NHTS sample of transit trips, followed by a series of sections that address critical issues facing public transportation. The report is not necessarily comprehensive but rather targets issues of particular research and or policy interest. The objective of this ...
  • Evaluation of MSCR Testing for Adoption in ADOT Asphalt Binder Specifications
    Evaluation of MSCR Testing for Adoption in ADOT Asphalt Binder Specifications
    Kaloush, Kamil E. ;
    Underwood, B. Shane
    2019-08-01 | PDF
    The purpose of this study is to recommend whether ADOT should consider adopting AASHTO T 350, Standard Method of Test for Multiple Stress Creep Recovery (MSCR) Test of Asphalt Binder Using a Dynamic Shear Rheometer (DSR), and AASHTO M 332,Standard Specification for Performance-Graded Asphalt Binder Using Multiple Stress Creep Recovery (MSCR) Test. ...
  • Estimating Camber Deflection and Prestress Losses in Precast Prestressed Bridge Girders
    Estimating Camber, Deflection, and Prestress Losses in Precast, Prestressed Bridge Girders
    Almohammedi, Ahmed ;
    Hale, W Micah
    2019-08-01 | PDF
    Many medium and long precast prestressed concrete girders have camber less than the design values. This discrepancy between the design and the actual camber creates construction problems during installing the cast-in-place concrete deck. The objective of this project is to improve the accuracy of estimating long-term camber, deflection, and prestre ...
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