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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 2961 - 2980 of 36873 results
  • Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load RatingsVolume 3 Refined Load Rating Recommendations and Examples
    Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings—Volume 3: Refined Load Rating Recommendations and Examples
    Hueste, Mary Beth ;
    Hurlebaus, Stefan
    2022-08-01 | PDF
    Maintaining the functionality of the transportation infrastructure depends on the successful management of aging bridge assets. Departments of Transportation rely on the load rating process to evaluate the sufficiency of the bridge structures in their state, and post load restrictions if the capacity of a bridge does not meet the maximum load effec ...
  • Performance of Ground Tire Rubber Modified Asphalt Mixture Overlays Over Jointed Concrete Pavements on US 60 in the Virginia Department of Transportations Richmond District
    Performance of Ground Tire Rubber Modified Asphalt Mixture Overlays Over Jointed Concrete Pavements on US 60 in the Virginia Department of Transportation’s Richmond District
    Nair, Harikrishnan ;
    Hossain, Shabbir
    2022-08-01 | PDF
    Ground tire rubber (GTR) from scrap tires is used in asphalt mixtures (rubber modified asphalt [RMA]) for improving the performance of pavements. There are different ways to add GTR in asphalt mixtures, but the two primary methods are referred to as the “wet” and “dry” processes. The dry process incorporates GTR directly into the asphalt mixture du ...
  • 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 ...
  • 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 ...
  • 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). ...
  • 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 ...
  • 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 | 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 ...
  • Female Crash Fatality Risk Relative to Males for Similar Physical Impacts
    Female Crash Fatality Risk Relative to Males for Similar Physical Impacts
    Noh, Eun Young ;
    Atwood, Jonathan Richard Edward
    2022-08-01 | PDF
    A previous NHTSA study in 2013 reported that females have a higher estimated fatality risk than males in comparable crashes (i.e., from similar physical impacts) as front row occupants when the full history of all fatal crashes are considered. This report updates NHTSA's previous analysis to examine the effect of sex on driver-side or right-front p ...
  • Traffic Safety Facts Driver Electronic Device Use in 2021
    Traffic Safety Facts: Driver Electronic Device Use in 2021
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2022-08-01 | PDF
    The percentage of passenger vehicle drivers talking on handheld phones decreased from 2.6 percent in 2020 to 2.5 percent in 2021 (Figure 1 and Table 1). The percentage of drivers speaking with visible headsets while driving remained unchanged from the previous year's level of 0.4 percent (Figure 1 and Table 2). Drivers' visible manipulation of hand ...
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