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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 4041 - 4060 of 36011 results
  • Nebraska Rail Crossing Safety Research
    Nebraska Rail Crossing Safety Research
    Khattak, Aemal ;
    Kang, Yashu
    2020-12-01 | PDF
    The research objectives of this project were to update Nebraska Department of Transportation (NDOT) 1999 Nebraska Accident Prediction Model for Highway-Rail Grade Crossings (HRGCs) and to develop guidelines using Lancaster County Nebraska HRGCs for improving safety at urban gated HRGCs that are not designated quiet zones but are in the vicinity of ...
  • AgentBased Modeling of Emergency Management Networks With Public Mobilization After a Disaster
    Agent-Based Modeling of Emergency Management Networks With Public Mobilization After a Disaster
    Fischer, Erica ;
    Wang, Haizhong
    2020-12-01 | PDF
    Local, state, and federal governments are responsible for managing disaster response with the goal of increasing disaster resilience of a community. This includes continuing adequate service levels for critical infrastructure sectors, reducing response time and cost, and ensuring the ongoing safety of the community. Complex emergency management sys ...
  • Investing in Californias Transportation Future Public Opinion on Critical Needs
    Investing in California’s Transportation Future: Public Opinion on Critical Needs
    Agrawal, Asha Weinstein ;
    Nixon, Hilary
    2020-12-01 | PDF
    In 2017, the State of California adopted landmark legislation to increase the funds available for transportation in the state: Senate Bill 1 (SB1), the Road Repair and Accountability Act of 2017. Through a combination of higher gas and diesel motor fuel taxes, SB1 raises revenue for four critical transportation needs in the state: road maintenance ...
  • Development of a Systemic Safety Improvement Plan for TwoLane Rural Roads in Virginia
    Development of a Systemic Safety Improvement Plan for Two-Lane Rural Roads in Virginia
    Cho, Hyun W. ;
    Cottrell Jr, Benjamin H
    2020-12-01 | PDF
    About 17,500 crashes per year occur on the more than 32,800 lane-miles of undivided two-lane rural roads maintained by the Virginia Department of Transportation (VDOT), and crash numbers are increasing. Roadway departure (RD) crashes comprise about 58% of crashes on these roads. Since these crashes are widely distributed across the state, determini ...
  • Safety Performance of Rural FourLane Undivided Roadways and Rural FourLane Roadways with a TwoWay LeftTurn Lane
    Safety Performance of Rural Four-Lane Undivided Roadways and Rural Four-Lane Roadways with a Two-Way Left-Turn Lane
    Liu, Jun ;
    Penmetsa, Praveena
    2020-12-01 | PDF
    Non-traversable medians consistently yielded improved safety performance compared to other median types such as undivided, 4- feet flush medians, and two-way left-turn lane cross-sections. However, constructing non-traversable medians can be costly. The goal of this study is to 1) examine the safety performance of existing rural four-lane roadways ...
  • Literature Search on Use of Flexible Pipes in Highway Engineering for DOTDs Needs Tech Summary
    Literature Search on Use of Flexible Pipes in Highway Engineering for DOTD’s Needs [Tech Summary]
    Jafari, Navid H ;
    Zhang, Zhongjie
    2020-12-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD), through the Louisiana Standard Specifications of Roads and Bridges, gives a thorough guideline to what is required for the implementation of pipes for culverts and storm drains. The design procedures, design criteria, and implementation process for plastic pipes has been widely inve ...
  • Bridge Decks Mitigation of Cracking and Increased DurabilityMaterials Solution Phase III
    Bridge Decks: Mitigation of Cracking and Increased Durability—Materials Solution (Phase III)
    Deb, Robin ;
    Mondal, Paramita
    2020-12-01 | PDF
    Type K cement offers a lower slump than conventional concrete, even at a higher water-to-cement ratio. Therefore, a suitable chemical admixture should be added to the Type K concrete mix design at a feasible dosage to achieve and retain target slump. In this project, a compatibility study was performed for Type K concrete with commercially availabl ...
  • 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 ...
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