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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 2501 - 2520 of 35909 results
  • Crash Modification Factors for Contrast Pavement Markings on LightColored Pavement
    Crash Modification Factors for Contrast Pavement Markings on Light-Colored Pavement
    Williamson, Michael ;
    Singh, Sumit
    2022-08-01 | PDF
    Roadway departure crashes are a leading cause of fatal and severe injury crashes on high-speed roadways. The objective of this project was to evaluate the safety benefits of contrast pavement markings and to develop a benefit-cost analysis tool for use in project selection. A nationwide survey was developed and deployed to departments of transporta ...
  • Impacts of COVID19 on Public Transit Ridership
    Impacts of COVID-19 on Public Transit Ridership
    Qi, Yi ;
    Liu, Jinli
    2022-08-01 | PDF
    The impacts of COVID-19 on public transit have been substantial. The public transit agencies are facing unprecedented challenges, including operator absenteeism, a sharp decline in ridership, new disinfection practices, and the maintenance of personal protective equipment (PPE) for the safety of operators and riders. Meanwhile, public transit is cr ...
  • An Evaluation of the Safe Speed Limit Setting Procedure and Tool for Utah
    An Evaluation of the Safe Speed Limit Setting Procedure and Tool for Utah
    Schultz, Grant G. ;
    Ward, Cory K
    2022-08-01 | PDF
    The purpose of the research project is to evaluate the Speed Limit Setting Procedure (SLS-Procedure) found in National Cooperative Highway Research Program (NCHRP) Project 17-76 for implementation on Utah roadways with the goal of aiding the agency in overall road safety surrounding speed limits. The Speed Limit Setting Tool (SLS-Tool) automates th ...
  • Evaluation of Mitigation Measures and Development of an UltraAccelerated Test to Evaluate Alkali Silica Reaction Potential in Concrete
    Evaluation of Mitigation Measures and Development of an Ultra-Accelerated Test to Evaluate Alkali Silica Reaction Potential in Concrete
    Hossain, Md Tarik ;
    Pachel, Caleb
    2022-08-01 | PDF
    A comprehensive study was performed to evaluate mitigation options to reduce premature expansion due to alkali-silica reaction (ASR) for selected Wyoming aggregates. State-of-the-art and standardized test methods were performed, and results were used to compare expansion levels. Two different fly-ash sources were tested using the Concrete Prism Tes ...
  • Fish Passage Engineering Research
    Fish Passage Engineering Research
    Lang, Margaret ;
    Love, Michael L.
    2022-08-01 | PDF
    Caltrans Division of Research Innovation and System Information (DRISI) initiated the Fish Passage Engineering Project with the objective of evaluating the implementation of recent fish passage road crossings. Crossings that span the bankfull channel width, referred to as full span crossings, were of primary interest given their recognized benefits ...
  • Evaluation of Connected Vehicle Applications on Mahan Corridor Phase II Summary
    Evaluation of Connected Vehicle Applications on Mahan Corridor, Phase II [Summary]
    Moses, Ren
    2022-08-01 | PDF
    Florida State University researchers evaluated RSU-OBU communications that deliver signal phase and timing (SPaT) data and roadway geometry data (MAP) to OBU-equipped vehicles via digital short-range communications (DSRC), for both the efficacy of the system and for improvements in the efficiency and safety of road users along a corridor of signali ...
  • Acoustic Effectiveness of Vinyl Fence Noise Walls
    Acoustic Effectiveness of Vinyl Fence Noise Walls
    Burton, Kimberly ;
    Agarwal, Ruchi
    2022-08-01 | PDF
    There are currently a variety of materials from which noise walls can be constructed, but there has been limited research on vinyl noise walls, so this project studied the acoustic, aesthetic, and cost benefits of vinyl materials to guide future noise mitigation implementation strategies. The research team studied vinyl noise walls to determine if ...
  • Development of a Strategy To Address LoadPosted Bridges Through Reduction in Uncertainty in Load RatingsVolume 1 Basic Load Rating
    Development of a Strategy To Address Load-Posted Bridges Through Reduction in Uncertainty in Load Ratings—Volume 1: Basic Load Rating
    Hueste, Mary Beth D. ;
    Hurlebaus, Stefan
    2022-08-01 | PDF
    According to the 2016 National Bridge Inventory data, the state of Texas houses over 2100 bridges posted at load levels below the legal limit. While load postings are generally a management issue, there can be commerce, traffic, and emergency egress issues. For this reason, removing postings is always of interest. Posted structures come in all shap ...
  • Understanding the Needs of Current and Potential Bus Transit Riders Technical Brief
    Understanding the Needs of Current and Potential Bus Transit Riders [Technical Brief]
    New Jersey. Department of Transportation. Bureau of Research
    2022-08-01 | PDF
    With the assumption that transit ridership decline can be addressed by retaining current riders and attracting new riders, this research seeks to examine the needs and barriers of current riders and potential riders in the context of NJ TRANSIT’s local bus service. The potential riders for this research are the riders who stopped riding the bus for ...
  • Understanding the Needs of Current and Potential Bus Transit Riders
    Understanding the Needs of Current and Potential Bus Transit Riders
    Deka, Devajyoti
    2022-08-01 | PDF
    In the context of the pre-COVID local bus ridership decline for NJ TRANSIT, this research began with two primary objectives: (a) identify the needs of the current and potential bus riders, and (b) identify strategies to address the ridership decline with an understanding of those needs. Because this research began before the COVID-19 pandemic, its ...
  • Occupant Restraint Use in 2021 Results from the NOPUS Controlled Intersection Study
    Occupant Restraint Use in 2021: Results from the NOPUS Controlled Intersection Study
    Boyle, Lacey L
    2022-08-01 | National Transportation Statistics (NTS) | PDF
    This report presents results from the 2021 National Occupant Protection Use Survey (NOPUS) Controlled Intersection Study, the only nationwide probability-based occupant restraint use survey. NHTSA’s National Center for Statistics and Analysis conducts this survey annually. The 2021 NOPUS found no significant changes in seat belt use in rear seats f ...
  • Combined Behavioral and Engineering Approach to Preventing Highway Fatalities
    Combined Behavioral and Engineering Approach to Preventing Highway Fatalities
    Blandford, Benjamin ;
    Souleyrette, Reginald
    2022-08-01 | PDF
    Traditional, single-discipline highway safety approaches can be augmented through multidisciplinary approaches that consider both engineering and behavioral interventions (e.g., education, enforcement, public outreach campaigns). Leveraging a systems-based conceptual framework of roadway safety, multiple forms of statistical and geospatial analysis ...
  • Highway Lighting Test Bed on INDOT Facility OffRoadway
    Highway Lighting Test Bed on INDOT Facility (Off-Roadway)
    Hu, Xiaoqiang ;
    Bao, Jieyi
    2022-08-01 | PDF
    According to the National Highway Traffic Safety Administration (NHTSA), during 2016 there were 7,277,000 vehicle crashes nationally. Among them, approximately 70% happened during the daytime and around 30% of crashes occurred during the nighttime. There were 11,375 nighttime fatal crashes that account for about 48% of total fatal crashes (23,714). ...
  • North Dakota Statewide Traffic Safety Survey 2022 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2022: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2022-08-01 | PDF
    The statewide driver traffic safety survey provides baseline metrics for the Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In addition to the core issues, qu ...
  • Determining Design Criteria for Land and Flow Characteristics That Produce NonErosive Sheet Flow
    Determining Design Criteria for Land and Flow Characteristics That Produce Non-Erosive Sheet Flow
    Goodall, Jonathan L. ;
    Nelson, Jake D
    2022-08-01 | PDF
    If a design engineer can show that a project site will produce non-erosive sheet flow, the cost and complexity of stormwater control measures that must be built for that site can be significantly reduced. However, the criteria for establishing non-erosive sheet flow are not well defined in the Virginia Department of Transportation (VDOT) Drainage M ...
  • Understanding the Impact of Autonomous Vehicles on LongDistance Passenger and Freight Travel in Texas Final Report
    Understanding the Impact of Autonomous Vehicles on Long-Distance Passenger and Freight Travel in Texas: Final Report
    Kockelman, Kara ;
    Huang, Yantao
    2022-08-01 | PDF
    In efforts to predict the long-distance travel impacts (for passengers and freight) of self-driving cars and trucks across Texas and the US, researchers estimated models for long-distance domestic passenger and freight trips before and after the introduction of autonomous vehicles (AVs) and applied the passenger models to a 10%synthetic US populati ...
  • Statewide Implementation of New Binder Selection Catalog and New Binder Performance Tests Project Summary Report
    Statewide Implementation of New Binder Selection Catalog and New Binder Performance Tests [Project Summary Report]
    Zhou, Fujie ;
    Hu, Sheng
    2022-07-31 | PDF
    This project evaluated many softer but polymer-modified asphalt binders (PGxx-28 and PGxx-34) in both laboratory and field test sections. Binder tests, such as the multiple stress creep recovery (MSCR), linear amplitude sweep (LAS), and pure linear amplitude sweep (PLAS), were performed to evaluate binders’ rutting and cracking resistance. Mixture ...
  • Local Technical Assistance Program Support on ComputerBased FDOT Intersection Control Evaluation ICE Training
    Local Technical Assistance Program Support on Computer-Based FDOT Intersection Control Evaluation (ICE) Training
    Chen, Cong ;
    Lin, Pei-Sung
    2022-07-31 | PDF
    Florida is among the top states in the U.S. regarding intersection-related traffic fatalities, and the Florida Strategic Highway Safety Plan (SHSP) identified intersection safety as one of the Emphasis Areas. The Florida Department of Transportation (FDOT) has developed an Intersection Control Evaluation (ICE) manual and conducted in classroom ICE ...
  • Concrete Deterioration of Prestressed Bridge Beams
    Concrete Deterioration of Prestressed Bridge Beams
    Attanayake, Upul ;
    Berke, Neil
    2022-07-31 | PDF
    The mild to significant concrete deterioration observed on many prestressed concrete (PSC) beam bridges constructed in the 1970’s and 1980’s was suspected to be due to alkali-aggregate reactivity (AAR) and other material compatibility issues. The inventory analysis and field inspections identified a total of 136 I-beam bridges (~12% of the I-beam b ...
  • Quantify the Valuation of RightofWay Project Summary
    Quantify the Valuation of Right-of-Way [Project Summary]
    Kraus, Edgar ;
    Holik, William
    2022-07-31 | PDF
    The goal of this research was twofold. First, researchers sought to develop a valuation framework for the right-of-way that could be used to assess fees for leases with private parties. The fees must consider different types, lengths, durations, and locations of installations by third parties. The second goal was to determine the prevalence of thir ...
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