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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 2441 - 2460 of 35909 results
  • 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 ...
  • Illinois Highway Materials Sustainability Efforts 2021
    Illinois Highway Materials Sustainability Efforts 2021
    Morse, Kelly L.
    2022-08-24 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Developing Countermeasures to Decrease Pedestrian Deaths
    Developing Countermeasures to Decrease Pedestrian Deaths
    Kockelman, Kara M. ;
    Perrine, Kenneth A.
    2022-08-01 | PDF
    In efforts to reverse the rising rate of pedestrian-related crashes in Texas, researchers analyze crash data to determine common causes and effective countermeasures. Extensive use of visualizations, regression models, advanced tree-based analysis, and geographic information system (GIS)-based data management adds insight. Significant variables inc ...
  • Development of a PerformanceRelated Test for Designing Seal Coats Project Summary
    Development of a Performance-Related Test for Designing Seal Coats [Project Summary]
    Bhasin, Amit ;
    Adwani, Dheeraj
    2022-08-01 | PDF
    The researchers investigated the effects of several influencing factors on the performance of seal coats based on a thorough literature review and a survey of TxDOT and other state DOT personnel. They evaluated tests that could be used to measure the binder-aggregate compatibility and adhesion. The study used modifications of a Sweep test and Viali ...
  • The State of Practice in Community Impact Assessment
    The State of Practice in Community Impact Assessment
    Barajas, Jesus M. ;
    Braun, Lindsay M
    2022-08-01 | PDF
    The objective of this research was to provide recommendations to the Illinois Department of Transportation for updating and revising the “Community Impact Assessment Manual” in accordance with the latest research and practice. The guide incorporated findings from a literature review, a scan of state department of transportation (DOT) community impa ...
  • Assessment Repair and Replacement of Bridges Subjected to Fire
    Assessment, Repair, and Replacement of Bridges Subjected to Fire
    Dahlberg, Justin ;
    Phares, Brent M.
    2022-08-01 | PDF
    Although bridge fires are not frequent events, they pose impacts on safety, traffic flow, and the economy given bridge repairs or replacement can be costly. A lack of information and the tools needed to evaluate fire damage to concrete bridges and to aid in decisions for both immediate and long-term use of fire-damaged bridges was the impetus for t ...
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