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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 4481 - 4500 of 36908 results
  • Pedestrian and Bicyclist Crash Risk in Low Income and Minority Areas An Examination of AtRisk Population Segments and Environmental Risk Factors
    Pedestrian and Bicyclist Crash Risk in Low Income and Minority Areas: An Examination of At-Risk Population Segments and Environmental Risk Factors
    Dumbaugh, Eric ;
    Mitsova, Diana
    2020-12-01 | PDF
    Socioeconomic status (SES) is a well-known predictor of crash risk, with lower income and minority populations being disproportionately likely to be injured or killed in a traffic crash. There has been little substantive examination of the specific nature of the crash risk experienced by lower income populations. This study examines the characteris ...
  • Rapid Bridge Deck Joint Repair Investigation Phase III
    Rapid Bridge Deck Joint Repair Investigation – Phase III
    Morandeira, David ;
    Miller, Elizabeth
    2020-12-01 | PDF
    The Iowa Department of Transportation (DOT) funded a three-phase research project focusing on rapid bridge deck joint repair. Phase I focused on the documentation of current means and methods of bridge expansion joint maintenance and replacement. Under Phase II, a workshop with Iowa DOT personnel, engineers, and researchers identified possible impr ...
  • Mechanical Integrity and Sustainability of Prestressed Concrete Bridge Girders Repaired by Epoxy Injection Phase II
    Mechanical Integrity and Sustainability of Pre-stressed Concrete Bridge Girders Repaired by Epoxy Injection - Phase II
    Arson, Chloe ;
    Ji, Koochul
    2020-12-01 | PDF
    During pre-stress transfer, the bottom portion of steel-reinforced concrete girders is subjected to an important compression induced by the relaxation of tension in the bars, which opens longitudinal cracks along the horizontal axis. Reactions at the supports induce shear stress, which sometimes translates into additional diagonal cracks at the end ...
  • Estimating ROW Acquisition Project Timelines for Major Projects based on Analyzing ROW Acquisition Processes Phase I
    Estimating ROW Acquisition Project Timelines for Major Projects based on Analyzing ROW Acquisition Processes: Phase I
    Ashuri, Baabak ;
    Chung, Frederick
    2020-12-01 | PDF
    Prepared in cooperation with the Georgia Department of Transportation, Office Right of Way (ROW), this research found the current state of the practice in right of way acquisition among state DOTs to identify best practices with the greatest potential to improve ROW acquisition, including: (a) the organizational structures of the office of ROW, (b) ...
  • INDOT Research Program Benefit Cost Analysis Return on Investment for Projects Completed in FY 2019
    INDOT Research Program Benefit Cost Analysis – Return on Investment for Projects Completed in FY 2019
    McCullouch, Bob
    2020-12-01 | PDF
    To demonstrate the value of research and its implementation, the Governor’s Office requested an annual financial analysis of the Indiana Department of Transportation (INDOT) Research Program to determine the return on the research investment (ROI). This report is for the 35 research projects that completed in FY 2019. The ROI analysis will suppleme ...
  • Detection of Flaws in Asphalt Overlaid Concrete Bridge Decks Using Ultrasonic Guided Waves
    Detection of Flaws in Asphalt Overlaid Concrete Bridge Decks Using Ultrasonic Guided Waves
    Erdogmus, Ece
    2020-12-01 | PDF
    This paper presents the results from laboratory experiments to determine the capabilities of a recently developed nondestructive testing (NDT) approach for detecting the flaws at the asphalt-membrane-concrete layers and rebar-concrete interfaces for asphalt-overlaid reinforced concrete bridge decks. The novel Ultrasonic Guided Wave Leakage (UGWL) m ...
  • Field Implementation and Evaluation of LowCost Countermeasures for WrongWay Driving Crashes in Alabama
    Field Implementation and Evaluation of Low-Cost Countermeasures for Wrong-Way Driving Crashes in Alabama
    Zhou, Huaguo ;
    Xue, Chennan
    2020-12-01 | PDF
    Wrong-way driving (WWD) has been identified as a critical traffic safety problem. Research efforts have been made to mitigate WWD issues in Alabama, including investigating factors contributing to WWD crashes, modeling WWD risks at interchange terminals, and developing training materials for WWD countermeasures. The Alabama Department of Transporta ...
  • Preparing for a Driverless Future
    Preparing for a Driverless Future
    Piatkowski, Daniel P ;
    Pitla, Santosh
    2020-12-01 | PDF
    Autonomous vehicles (AVs) are widely considered to be the future of surface transportation in the United States, but little is understood about how people will interact with these vehicles, what they will use them for, and how they will impact our roads. However, farmers have been interacting with some degree of AV technology, primarily auto-guidan ...
  • Exploring NonTraditional Methods of Obtaining Vehicle Volumes
    Exploring Non-Traditional Methods of Obtaining Vehicle Volumes
    Codjoe, Julius ;
    Thapa, Raju
    2020-12-01 | PDF
    Big data analytics is being used to generate traffic data that may be used by an agency to supplement its routine data collection. StreetLight InSight ® and Streetlytics, produced by StreetLight Data and Bentley Systems respectively, are two such tools that promise to provide traffic volumes, including AADTs, for every roadway in the US. This study ...
  • Best Practices To Address Issues of Excess Aggregate Dust in Nebraska
    Best Practices To Address Issues of Excess Aggregate Dust in Nebraska
    Hu, Jiong ;
    Kim, Yong-Rak
    2020-12-01 | PDF
    The negative impacts of an excessive amount of dust on concrete performance have been known and reported in different states. The extent and impact of dust on concrete performance, which depends not only on quantity but also on the nature of dust could be complicated. For example, clay coatings showed a more harmful impact on concrete performance c ...
  • EcoFriendly Stabilization of SulfateRich Expansive Soils Using Geopolymers for Transportation Infrastructure
    Eco-Friendly Stabilization of Sulfate-Rich Expansive Soils Using Geopolymers for Transportation Infrastructure
    Yu, Xinbao ;
    Puppala, Anand J.
    2020-12-01 | PDF
    Traditional calcium-based stabilizers, such as lime, to stabilize sulfate-rich expansive soils, are lasting-challenges in geotechnical engineering. The biggest problem with using calcium-based stabilizers is that when calcium and water are exposed to sulfate-rich expansive soils, they form ettringite as an expansive mineral, which causes sulfate-in ...
  • Empowering the Indiana Bridge Inventory Database Toward Rapid Seismic Vulnerability Assessment
    Empowering the Indiana Bridge Inventory Database Toward Rapid Seismic Vulnerability Assessment
    Bonthron, Leslie ;
    Beck, Corey
    2020-12-01 | PDF
    With the recent identification of the Wabash Valley Seismic Zone in addition to the New Madrid Seismic Zone, Indiana’s Department of Transportation (INDOT) has become concerned with ensuring the adequate seismic performance of their bridge network. While INDOT made an effort to reduce the seismic vulnerability of newly-constructed bridges, many les ...
  • Guidelines for Installing Pedestrian Treatments at Midblock Locations
    Guidelines for Installing Pedestrian Treatments at Midblock Locations
    Alluri, Priyanka ;
    Kadeha, Cecilia
    2020-12-01 | PDF
    This study explored pedestrian safety treatments used at midblock locations to assist the Florida Department of Transportation (FDOT) in developing guidelines to improve pedestrian safety. The specific objectives included (a) identifying arterial corridors that are prone to pedestrian crashes, (b) recommending pedestrian treatments to be installed ...
  • Calibration of Highway Safety Manual Prediction Models for Freeway Segments SpeedChange Lanes Ramp Segments and Crossroad Ramp Terminals in Kansas
    Calibration of Highway Safety Manual Prediction Models for Freeway Segments, Speed-Change Lanes, Ramp Segments, and Crossroad Ramp Terminals in Kansas
    Dissanayake, Sunanda ;
    Matarage, Imalka Chiranthi
    2020-12-01 | PDF
    Crash prediction models in the Highway Safety Manual (HSM) are used to quantify the safety experience of new and existing roadways. Safety Performance Functions (SPFs) or crash prediction models are statistical formulas developed on limited data from a few selected states, Kansas not being one of those states. Therefore, the HSM recommends calibrat ...
  • Development of a Management Guide for Concrete Bridge Decks in Utah
    Development of a Management Guide for Concrete Bridge Decks in Utah
    Emery, Tenli Waters ;
    Polanco, Hannah
    2020-12-01 | PDF
    The objectives of this research were to 1) investigate bridge deck condition assessment methods used in the field and laboratory, methods of managing bridge decks, and methods for estimating remaining bridge deck service life using computer models through a comprehensive literature review on these subjects; 2) collect and analyze field data from re ...
  • Impact on Compaction of Virginias DenseGraded Asphalt Surface Mixtures From Recent Changes To Design and Construction Acceptance Criteria
    Impact on Compaction of Virginia’s Dense-Graded Asphalt Surface Mixtures From Recent Changes To Design and Construction Acceptance Criteria
    McGhee, Kevin K. ;
    Smith, Bryan L.
    2020-12-01 | PDF
    In 2016, the Virginia Department of Transportation implemented new design criteria for most dense-graded surface mixtures with the objective of improving material durability. The 2016 construction season was also significant for a series of pilot projects that were designed to explore how potential incentives for in-place density might affect const ...
  • Integrating Advanced Technologies into Winter Operations Decisions
    Integrating Advanced Technologies into Winter Operations Decisions
    Minge, Erik ;
    Gallagher, Mark R.
    2020-12-01 | PDF
    This report summarizes the state of the practice in the application of advanced technologies to winter road maintenance operations. Information was captured through a combination of literature search, surveys, and interviews with key stakeholders. Several promising technologies were identified as areas of interest. These areas include connected aut ...
  • Investing in Bicycle Infrastructure To Spur Statewide Economic Growth Through Bicycle Tourism
    Investing in Bicycle Infrastructure To Spur Statewide Economic Growth Through Bicycle Tourism
    Aguero Arroyo, Pedro ;
    Piatkowski, Daniel P
    2020-12-01 | PDF
    Bicycle tourism is a growing industry that has been shown by prior studies to contribute significantly to the economy of numerous states. The economic benefits of recreational bicycling are not limited to the direct effects of the transactions of bicyclists in related industries, but also spillover effects such as the reduction of automobile activi ...
  • A Synthesis of Passive ThirdParty Data Sets Used for Transportation Planning
    A Synthesis of Passive Third-Party Data Sets Used for Transportation Planning
    Macfarlane, Gregory S ;
    Copley, Michael J
    2020-12-01 | PDF
    This report summarizes an extensive review of academic and professional research making use of third-party data products available to transportation agencies. In particular, the review focused on studies conducted with Bluetooth receivers, Global Positioning System (GPS) devices, and mobile device data (MDD) obtained through cellular networks and l ...
  • Interchange Design To Accommodate Ramp Metering System
    Interchange Design To Accommodate Ramp Metering System
    Washburn, Scott S. ;
    Shastri, Akhilesh
    2020-12-01 | PDF
    The majority of the existing research regarding ramp metering has largely been focused on ramp signal timing algorithms and/or the design of the on-ramp itself for accommodating ramp metering operations, irrespective of the particular overall interchange design. However, what is generally lacking is research that considers how ramp metering should ...
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