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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 36114 results
  • Analyze Business Models for Implementation and Operation of a Statewide GNSS RTN
    Analyze Business Models for Implementation and Operation of a Statewide GNSS RTN
    Al-Kaisy, Ahmed ;
    Teixeira, Rafael
    2022-10-01 | PDF
    The Global Navigation Satellite System (GNSS), commonly known as the global positioning system, has become one of the fastest-growing emerging technologies delivering location services to various sectors. The applications of geospatial data span every sphere of modern-day science and industry where geographical positioning matters. The list include ...
  • Develop Guidelines and Best Practices for Bonding HotMix Asphalt to Portland Cement Concrete Pavement Final Report
    Develop Guidelines and Best Practices for Bonding Hot-Mix Asphalt to Portland Cement Concrete Pavement: Final Report
    Komaragiri, Satyavati ;
    Drimalas, Thanos
    2022-10-01 | PDF
    Proper bonding between different layers of a composite pavement is the major factor in ensuring that the entire structure acts as a monolithic layer under loading. This bonding is provided by a thin layer of tack coat that is applied between the pavement layers. This project studied the bonding between hot mix asphalt (HMA) and concrete layers of a ...
  • Development of Statewide Design Guidelines for Improving Pedestrian Safety on HighSpeed Arterials in Louisiana Research Project Capsule
    Development of Statewide Design Guidelines for Improving Pedestrian Safety on High-Speed Arterials in Louisiana [Research Project Capsule]
    Hassan, Hany ;
    Rupnow, Tyson
    2022-10-01 | PDF
    The alarming increase in pedestrian fatalities across the globe is concerning. According to the National Highway Traffic Safety Administration (NHTSA), 36,096 people were killed in transportation-related crashes in the United States in 2019, of which 6,205 were pedestrians. Louisiana’s pedestrian deaths rose 35.2% from 2015 to 2020. In 2020, Louisi ...
  • Work Zone Speed Limits and Motorist Compliance Tech Transfer Summary
    Work Zone Speed Limits and Motorist Compliance: Tech Transfer Summary
    Savolainen, Peter ;
    Gates, Timothy
    2022-10-01 | PDF
    This study sought to identify best practices for setting work zone speed limits by state departments of transportation (DOTs) and to evaluate select strategies for improving compliance with work zone speed limits. The objectives of this project were achieved by synthesizing information from a literature review, a state DOT survey, and field evaluat ...
  • Evaluating the Accuracy and Use of Drilled Shaft Integrity Testing Methods in Illinois
    Evaluating the Accuracy and Use of Drilled Shaft Integrity Testing Methods in Illinois
    Stark, Timothy D. ;
    Idries, Abedalqader
    2022-10-01 | PDF
    In this project, thermal integrity profile (TIP) and crosshole sonic logging (CSL) tests were performed on three test drilled shafts in three locations in Illinois to determine which technology is more effective at identifying installed defects in drilled shafts. TIP testing was found to be more effective than CSL in identifying installed defects o ...
  • Development of Deterioration Curves for Bridge Elements in Montana
    Development of Deterioration Curves for Bridge Elements in Montana
    Fick, Damon ;
    Bell, Matthew
    2022-10-01 | PDF
    The Federal Highway Administration has established measures for state departments of transportation to develop an asset management plan that includes deterioration forecasting to improve or preserve bridge conditions. The primary objective of this research was to support Montana’s bridge management system by developing state-specific deterioration ...
  • Assessing Traffic Threats for Amphibian and Reptile Species of Greatest Conservation Need on Texas Roadways Final Report
    Assessing Traffic Threats for Amphibian and Reptile Species of Greatest Conservation Need on Texas Roadways: Final Report
    Walkup, Danielle K ;
    Skow, Kevin L
    2022-10-01 | PDF
    Many environmental impacts involve state and federally listed threatened and endangered (TE) species. Wildlife-vehicle collision (WVC) data can improve environmental impact assessments for TE species. Accurate WVC data has been collected for amphibian and reptile species on Texas roadways since 2012, in the form of observations in the “Herps of Tex ...
  • Work Zone Speed Limits and Motorist Compliance
    Work Zone Speed Limits and Motorist Compliance
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2022-10-01 | PDF
    This study sought to identify best practices for setting work zone speed limits by state departments of transportation (DOTs) and to evaluate select strategies for improving compliance with work zone speed limits. This was achieved by synthesizing information from a literature review, a state DOT survey, and field evaluations of select speed manage ...
  • Developing Guidelines for Precoating of Aggregates Used in Seal Coats Report
    Developing Guidelines for Precoating of Aggregates Used in Seal Coats [Report]
    Lopez, Erica ;
    Rung, Michael
    2022-10-01 | PDF
    Seal coats in Texas are unique because most binder is hot applied, and aggregates are precoated. Precoating eliminates dust and improves adhesion between aggregate and binder. There currently exists no guidelines or specifications in place that can allow engineers to specify and accept the quality and extent of binder used to precoat aggregates. Pr ...
  • Synthesis of Automated Pedestrian Data Collection Technologies Report
    Synthesis of Automated Pedestrian Data Collection Technologies [Report]
    Haddad, Angela ;
    Macias, Lisa
    2022-10-01 | PDF
    Through academic research and direct communications with transportation agencies, this project surveys new roadside technologies that can assist in efforts for detecting pedestrians. Reasons for using such technologies include traffic operations enhancements, safety improvements, planning, benchmarking, and eventual connected vehicle integrations. ...
  • Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Sylcott, Brian
    2022-10-01 | PDF
    A 2014 change in vehicle appearance guidelines forwent custom bright yellow paint job in favor of the factory standard white color for NCDOT light duty trucks. This change raised some concerns about vehicle conspicuity, or the vehicle’s ability to draw attention to itself. The addition of high visibility markings was offered as a possible solution. ...
  • Hightension Cable Median Barrier Safety Effectiveness Evaluation
    High-tension Cable Median Barrier Safety Effectiveness Evaluation
    Storm, Richard ;
    Srinivasan, Raghavan
    2022-10-01 | PDF
    The objective of this study was to evaluate the change in crash frequency or severity of varying lateral offset distances of high-tension cable median barriers in Minnesota. Crash and traffic data from 2016 to present were conjoined with roadway cross-sectional data and high-tension cable barrier locations to perform cross-sectional analyses for in ...
  • Evaluation of NonSBS Modified Binders Using the Multiple Stress Creep Recovery Test
    Evaluation of Non-SBS Modified Binders Using the Multiple Stress Creep Recovery Test
    Mata, David ;
    Salari, Saman
    2022-10-01 | PDF
    The Multiple Stress Creep Recovery (MSCR) test can characterize polymer-modified asphalt binders and correlates well with the mixture rutting parameters. The MSCR is able to complement a suite of additional binder tests, namely Dynamic Modulus, Phase Angle, and “PG-Plus” tests. A recently-completed MSCR study conducted by the LTRC recommended that ...
  • Domestic Airline Fares Consumer Report Second Quarter 2022 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Second Quarter 2022 Passenger and Fare Information
    United States. Department of Transportation
    2022-10-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Utilization of UHPC Bridge Superstructures in Texas Summary
    Utilization of UHPC Bridge Superstructures in Texas [Summary]
    Schwerdt, Tom ;
    Hueste, Mary Beth D.
    2022-10-01 | PDF
    The advanced material properties and superior durability of ultra-high-performance concrete (UHPC) provide an opportunity for significant design and construction benefits for Texas bridges. However, several challenges have slowed the application of UHPC in the precast industry, such as the high cost of proprietary UHPC mixtures, slower production d ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Final Guidebook
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs: Final Guidebook
    Asmussen, Katherine ;
    Mondal, Aupal
    2022-10-01 | PDF
    This guidebook will outline the design, development, and deployment of an SP experiment alongside an entire RP-SP survey to best harness the information provided by respondents on behaviors, attitudes, and reactions to both the future and past, the hypothetical and real. Once the RP-SP survey has been designed and deployed, responses have been coll ...
  • Mobile PhoneBased Artificial Intelligence Development for Maintenance Asset Management
    Mobile Phone-Based Artificial Intelligence Development for Maintenance Asset Management
    Kuang, Biao ;
    Chen, Jianli
    2022-10-01 | PDF
    Transportation asset management needs timely information collection to inform relevant maintenance practices (e.g., resource planning). Traditional data collection methods in transportation asset management require either manual operation or support of unique equipment (e.g., Light Detection and Ranging (LiDAR)), which could be labor-intensive or c ...
  • Quantification of Systemic Risk Factors for Pedestrian Safety on North Carolina
    Quantification of Systemic Risk Factors for Pedestrian Safety on North Carolina
    Gayah, Vikash V. ;
    Guler, S. Ilgin
    2022-10-01 | PDF
    Pedestrian safety is a growing concern for transportation planners and safety engineers within North Carolina and across the country. Pedestrians are extremely vulnerable users of the transportation system and are particularly subject to serious injuries and fatalities in the event of a crash. For example, while pedestrians are involved in just 1% ...
  • MASH TL4 Engineering Analyses and Detailing of 36Inch and 42Inch High Median Barriers for DOTD Research Project Capsule 231ST
    MASH TL-4 Engineering Analyses and Detailing of 36-Inch and 42-Inch High Median Barriers for DOTD [Research Project Capsule] [23–1ST]
    Williams, William ;
    Rupnow, Tyson
    2022-10-01 | PDF
    The objectives of this research will be achieved through conducting an engineering strength analysis on the four proposed retrofit designs considered for this project in accordance with AASHTO LRFD Section 13 Specifications for MASH Test Level 4 impact conditions.
  • Design Consistency on Corridors
    Design Consistency on Corridors
    Cunningham, Christopher M. ;
    Chase, R. Thomas
    2022-10-01 | PDF
    Alternative Intersection and Interchange (AII) designs provide an innovative approach to the geometric and control features at intersections. Nevertheless, most of the AII designs have unconventional ways to maneuver through the intersection such as restriction of movements, crossover of traffic to the opposite side of the road, separating left tur ...
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