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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 2901 - 2920 of 36873 results
  • Infrastructure Needs North Dakotas County Township and Tribal Roads and Bridges 20222041
    Infrastructure Needs: North Dakota’s County, Township, and Tribal Roads and Bridges: 2022-2041
    Upper Great Plains Transportation Institute  ...
    2022-09-01 | PDF
    This report is the response to the North Dakota Legislature's request for a study of the transportation infrastructure needs of all counties, townships and tribes in the state. In 2019, the North Dakota Legislature advanced HB 1066 which had a provision for funding distributions to non-oil producing counties based on the most recent version of this ...
  • Traffic Safety Facts 2020 Data 2020 State Traffic Data
    Traffic Safety Facts 2020 Data: 2020 State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2022-09-01 | PDF
    This fact sheet contains information on fatal motor vehicle traffic crashes based on data from the Fatality Analysis Reporting System (FARS). Refer to the end of this publication for more information on FARS.
  • NonTraffic Surveillance Analytical Users Manual 20162020
    Non-Traffic Surveillance Analytical User's Manual, 2016-2020
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2022-09-01 | PDF
    This is the updated and revised Non-Traffic Surveillance (NTS) Analytical User's Manual for the period 2016 to 2020.
  • 3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap AggregatesPhase 2
    3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap Aggregates-Phase 2
    Huang, Haohang ;
    Tutumluer, Erol
    2022-09-01 | PDF
    Riprap rock and aggregates are extensively used in structural, transportation, geotechnical, and hydraulic engineering applications. Field determination of morphological properties of aggregates such as size and shape can greatly facilitate the quality assurance/quality control (QA/QC) process for proper aggregate material selection and engineering ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Project Summary
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs [Project Summary]
    Bhat, Chandra ;
    Asmussen, Katherine
    2022-08-31 | PDF
    This project’s two objectives were: 1) Exemplify state-of-the-art SP techniques and recommend the addition of SP experiments to existing surveys to enhance their use for long-term travel forecasts. 2) Provide proof of concept and applicable travel behavior results through the design, deployment, and analysis of an RP-SP survey that concentrated on ...
  • 06923 Develop Guidelines and Design Program for Hot Mix Asphalts Containing RAP RAS and Other Additives through a Balanced Mix Design Process
    0-6923: Develop Guidelines and Design Program for Hot Mix Asphalts Containing RAP, RAS and Other Additives through a Balanced Mix Design Process
    Nazarian, Soheil ;
    Garcia, Vince
    2022-08-31 | PDF
    Asphalt mixtures must ideally exhibit acceptable cracking and rutting properties to perform well in major concern. Improving the durability and long-term performance of asphalt mixtures has become a major concern, especially with the rapidly increasing use of recycled materials, warm mix asphalt additives and modified binders. Given that available ...
  • Expand Applications for Texas Connected Freight Corridors Summary
    Expand Applications for Texas Connected Freight Corridors {Summary]
    Wood, Nick
    2022-08-31 | PDF
    The Texas Connected Freight Corridors (TCFC) system is a connected vehicle (CV) environment that seeks to improve safety and mobility for the Texas Triangle, which consists of the Austin, Dallas/Fort Worth, Houston, San Antonio, and Laredo metropolitan regions, as seen in Figure 1.
  • Understanding the Impact of Autonomous Vehicles on LongDistance Passenger and Freight Travel in Texas Project Summary
    Understanding the Impact of Autonomous Vehicles on Long-Distance Passenger and Freight Travel in Texas: Project Summary
    Kockelman, Kara ;
    Fakhrmoosavi, Fatemeh
    2022-08-31 | PDF
    Researchers simulated US transportation systems and forecasted the impacts of AVs and shared AVs (SAVs) on destination and mode choices of long-distance passenger and freight trips within the US, targeting a future 20+ years from now. They created demand sub-models for vehicle ownership, trip timing/scheduling and frequency, trip purpose and travel ...
  • Developing Guidelines for Precoating of Aggregates Used in Seal Coats Project Summary
    Developing Guidelines for Precoating of Aggregates Used in Seal Coats [Project Summary]
    Bhasin, Amit ;
    Lopez, Erica
    2022-08-31 | PDF
    Researchers investigated the effect of several influencing factors on the performance of precoated aggregates in seal coats based on a thorough literature review and a survey of TxDOT and other state DOT personnel. Researchers evaluated tests that measure the area of surface coating on precoated aggregate and determined that an image analysis techn ...
  • 07135 Synthesis of Best Application and Verification Practices for LongLife Pavement Markings Project Summary
    0–7135: Synthesis of Best Application and Verification Practices for Long-Life Pavement Markings [Project Summary]
    Qiao, Fengxiang ;
    Kazimi, Sayed Abuzar
    2022-08-31 | PDF
    To perform this project, the researchers followed five steps. In Step 1, the researchers collected information necessary for identifying best case examples of quality control of liquid and thermoplastic pavement marking material applications. They reviewed practices across the U.S. and other countries using various sources, such as government manua ...
  • Use of Tamper Bar Paver to Place ThickLift Asphalt Concrete Pavement Summary
    Use of Tamper Bar Paver to Place Thick-Lift Asphalt Concrete Pavement [Summary]
    Wilson, Bryan
    2022-08-31 | PDF
    Asphalt concrete placement specifications have maximum allowable lift thicknesses to ensure adequate mixture compaction. When the design thickness exceeds this limit, placement must be phased in multiple lifts, creating other problems: - Increased construction time, traffic exposure, and traffic disruption; - Potentially worse performance from poor ...
  • Synthesis for Best Practices for Preventive Maintenance Preparatory Work Summary
    Synthesis for Best Practices for Preventive Maintenance Preparatory Work [Summary]
    Goehl, Darlene ;
    Estakhri, Cindy
    2022-08-31 | PDF
    The synthesis study focused on pavement preparatory work performed before preventive maintenance (PM) surfacing contracts with the goal of answering, “What work needs to be performed to the roadway before a new surface is placed?” Preparatory work performed by in-house maintenance forces or maintenance contracts may include crack sealing, fog seal, ...
  • Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas Project Summary Report
    Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas [Project Summary Report]
    Zhou, Fujie ;
    Scullion, Tom
    2022-08-31 | PDF
    Researchers analyzed all the traffic data collected by both permanent and portable weigh-in-motion stations around Texas and developed default load spectrum inputs for interstate highways, state highways, FM roads, and energy development areas. The researchers then presented the six-step pavement rehabilitation and design strategy and applied it to ...
  • Calibrating the Highway Safety Manual Predictive Methods for Texas Highways Summary
    Calibrating the Highway Safety Manual Predictive Methods for Texas Highways [Summary]
    Geedipally, Srinivas R.
    2022-08-31 | PDF
    The Highway Safety Manual (HSM) contains safety performance functions (SPFs) that are used in project-level decision-making to estimate the average crash frequency by severity level for existing conditions, alternatives to existing conditions, or proposed new roadways. Because most existing HSM SPFs were developed for states other than Texas, SPF c ...
  • Synthesis of Automated Pedestrian Data Collecting Techniques and Applications in Transportation Planning Design and Management Project Summary
    Synthesis of Automated Pedestrian Data Collecting Techniques and Applications in Transportation Planning, Design, and Management [Project Summary]
    Perrine, Kenneth A. ;
    Haddad, Angela
    2022-08-31 | PDF
    In this project, researchers undertook a comprehensive literature review on the state-of-the-art and state-of-the-practice of manual and automated pedestrian data collection techniques. They assessed different automated data collection methods, including well-established and emerging AI- and sensor-based technologies, to evaluate their appropriaten ...
  • Determine Drainage Basin Mapping and Estimation of Hydroplaning Potential Project Summary
    Determine Drainage Basin Mapping and Estimation of Hydroplaning Potential [Project Summary]
    Gurganus, Charles ;
    Devadas, Arvind
    2022-08-31 | PDF
    The purpose of this project was to use mobile light detecting and ranging (LiDAR) measurements to measure surface geometry to map drainage basins on the pavement surface. Mobile LiDAR was used to collect measurements at highway speeds. Using mobile LiDAR technology fostered safety during data collection and provided a dense dataset over the roadway ...
  • Implementation of Automatic Traffic Signals Performance Measures Summary Report
    Implementation of Automatic Traffic Signals Performance Measures: Summary Report
    Sunkari, Srinivasa R ;
    Chaudhary, Nadeem
    2022-08-31 | PDF
    The scope of this project was to develop draft specifications of an ATSPM system for statewide deployment. These draft specifications will be used to develop formal specifications for the Texas Department of Transportation (TxDOT) to procure and deploy an ATSPM system. This project also aimed to develop guidelines for local agencies about making de ...
  • Synthesis for Best Practices for Developing 4Year Pavement Management Plans Summary
    Synthesis for Best Practices for Developing 4-Year Pavement Management Plans [Summary]
    Gurganus, Charles ;
    Goehl, Darlene
    2022-08-31 | PDF
    This project investigated and synthesized best practices for the development and execution of 4-year pavement management plans (PMPs) within the Texas Department of Transportation. Successful 4-year PMPs help provide the traveling public with a safe, comfortable, and reliable roadway network.
  • Optimizing Reinforcing Steel in 12inch and 13inch Continuously Reinforced Concrete Pavement CRCP Project Summary
    Optimizing Reinforcing Steel in 12-inch and 13-inch Continuously Reinforced Concrete Pavement (CRCP) [Project Summary]
    Won, Moon ;
    Bae, Sang Wook
    2022-08-30 | PDF
    Researchers analyzed the structural responses of CRCP using three-dimensional finite element modeling (3D-FEM) in Ansys at the depth of the longitudinal steel at transverse crack areas with various steel designs which, if excessive, could cause horizontal cracks. The output was used in selecting the steel designs that will be employed at the experi ...
  • Flood Mitigation Solutions
    Flood Mitigation Solutions
    Starkey, Richard ;
    Smith, Virginia
    2022-08-29 | PDF
    In Pennsylvania DOT District 6 expanding watershed development is increasing demands on roadways and worsening flooding. This research addresses the fundamental question: “How can flood mitigation improve the safety and sustainability of a road network?” While many studies have sought to understand the impacts of hydrologic events on driving condit ...
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