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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 2601 - 2620 of 36114 results
  • 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 ...
  • 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 ...
  • 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 ...
  • Use of Roundabouts and Innovative Intersection Designs at HighSpeed Intersections in Texas Project Summary
    Use of Roundabouts and Innovative Intersection Designs at High-Speed Intersections in Texas [Project Summary]
    Brewer, Marcus A. ;
    Fitzpatrick, Kay
    2022-07-31 | PDF
    Innovative intersection designs (e.g., diverging diamond interchanges [DDIs], displaced left turns [DLTs], median U-turns [MUTs], and restricted crossing U-turns [RCUTs]) and modern roundabouts have been used successfully to remove conflict points and redistribute turning traffic from traditional intersections. However, minimal guidance exists on u ...
  • BFRP Rebar Characterization and Performance Testing Protocol and Material Specifications for Basalt Fiber Reinforced Polymer Bars
    BFRP Rebar Characterization and Performance: Testing Protocol and Material Specifications for Basalt Fiber Reinforced Polymer Bars
    Kampmann, Raphael ;
    Tang, Youneng
    2022-07-30 | PDF
    This research was conducted to evaluate the performance of three commercially available BFRP rebar products and their individual raw material components, before and after exposure to nine different aggressive environments at 60°C for 300d and 600d, to development acceptance criteria specifically for basalt-based fiber reinforced polymer (BFRP) rein ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Workshop
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs: Workshop
    Bhat, Chandra ;
    Asmussen, Katherine
    2022-07-21 | PPT
    The research team (PA) will (1) identify state-of-the-art stated preference (SP) techniques, (2) develop a guidebook that explains the factors to consider when designing an integrated revealed preference (RP)-SP survey, (3) recommend to TxDOT the SP components that may be appended to existing surveys to enhance their use for long-term travel foreca ...
  • Improving Concrete Patching Practices on Iowa Roadways
    Improving Concrete Patching Practices on Iowa Roadways
    Nelson, Todd D. ;
    Pham, Le T.
    2022-07-08 | PDF
    This research effort aims to improve pavement patching practices in Iowa by identifying best practices used for portland cement concrete (PCC) pavement repairs in the upper Midwestern United States and by developing guidelines and tools for improved materials selection, repair installation, and quality assurance and quality control (QA/QC) of full- ...
  • Factors Affecting Development Decisions and Construction Delay of Housing in TransitAccessible and JobsRich Areas in California
    Factors Affecting Development Decisions and Construction Delay of Housing in Transit-Accessible and Jobs-Rich Areas in California
    Marantz, Nicholas J ;
    Houston, Douglas
    2022-07-01 | PDF
    Recent state legislation addresses California’s housing affordability crisis by encouraging new development in transit accessible and/or jobs-rich areas. But policymakers lack key information about the effects of laws and plans on developers’ decisions about whether and where to build housing, and factors contributing to delays in receiving governm ...
  • Fatigue Life of Double Notch Alloy Steel Breakaway Couplings
    Fatigue Life of Double Notch Alloy Steel Breakaway Couplings
    Hahin, Christopher
    2022-07-01 | PDF
    Double notch alloy steel breakaway couplings have sustained numerous fatigue failures during their service life in Illinois. This report is an in-depth analysis of breakaway couplings that ruptured, resulting in collapse of a light pole falling across a 55-mph expressway. Pole was fortunately cleared away by maintenance before any collisions occurr ...
  • Estimating Strength From Stiffness for Chemically Treated Soils
    Estimating Strength From Stiffness for Chemically Treated Soils
    Shivakumar, Pranavkumar ;
    Gupta, Kanika
    2022-07-01 | PDF
    The central theme of this study is to identify strength-stiffness correlations for chemically treated subgrade soils in Indiana. This was done by conducting Unconfined Compression (UC) Tests and Resilient Modulus Tests for soils collected at three different sites—US-31, SR-37, and I-65. At each site, soil samples were obtained from 11 locations at ...
  • Performance of Wicking Geotextile H2Ri To Mitigate Pavement Pumping Phase 2
    Performance of Wicking Geotextile (H2Ri) To Mitigate Pavement Pumping – Phase 2
    Galinmoghadam, Javad ;
    Zhang, Xiong
    2022-07-01 | PDF
    Pumping is one of the major factors contributing to pavement failures, which reduces the pavement life, affects road safety, and increases maintenance costs. Existing methods that are used as drainage systems can drain gravitational (free) water undersaturated conditions but not the capillary water under an unsaturated condition. The objective of t ...
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