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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 6361 - 6380 of 36049 results
  • Estimated Economic and Transportation System Impacts of Selected Georgia Department of Transportation Projects
    Estimated Economic and Transportation System Impacts of Selected Georgia Department of Transportation Projects
    Clarke, Wes ;
    Shepard, Tommie
    2018-11-01 | PDF
    This study estimates the economic impact of $1.8 billion in spending for road and bridge construction and maintenance in Georgia. This spending supported a total of 21,428 jobs in the state and produced $3.35 billion in total economic output.
  • Synthesis of LoadDeflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts Technical Report
    Synthesis of Load-Deflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts: Technical Report
    Briaud, Jean-Louis ;
    Wang, Yen-Chih
    2018-11-01 | PDF
    This project evaluated how well current P-y curves predict the behavior of large diameter piles subjected to monotonic lateral loading. Current P-y curves were developed about 60 years ago based on lateral load tests on piles, which were about 2 ft in diameter, while today’s pile diameters can reach 12 ft. This significant difference in scale bring ...
  • Determination of Traffic Adjustment Factors for Floridas High Tourist Activity Sites
    Determination of Traffic Adjustment Factors for Florida’s High Tourist Activity Sites
    Ozkul, Seckin ;
    Lin, Pei-Sung
    2018-11-01 | PDF
    Florida experiences heavy traffic demand on its roadways during the peak tourist season, especially near popular tourist destinations such as beaches and coastal areas and on weekends and holidays; thus, their monthly traffic adjustment factors are likely to be different from other roadways in Florida. The major objectives of this research were to ...
  • A Bridge Condition Index for Transportation Asset Management in Ohio
    A Bridge Condition Index for Transportation Asset Management in Ohio
    Fereshtehnejad, Ehsan ;
    Zhang, Chi
    2018-11-01 | PDF
    A comprehensive and practical performance measure, called Ohio Bridge Condition Index (OBCI), has been developed in this project. OBCI is a cost-based index that ranges from zero to one and represents the performance of bridges at element-, component-, bridge-, and network-levels. The index effectively uses ODOT’s bridge inventory and inspection da ...
  • Safety Assessment of Freeway Active Traffic Management by Exploring the Relationship Between Safety and Congestion
    Safety Assessment of Freeway Active Traffic Management by Exploring the Relationship Between Safety and Congestion
    Li, Xiugang (Joe) ;
    Knudson, Tony
    2018-11-01 | PDF
    This study has shown how Oregon crash incident data and PSU Portal traffic data can be combined to determine what factors lead to increased crash risk. Data related to Oregon highway 217 was used to conduct the analysis. The first analysis used Portal traffic data to determine Level of Service (LOS) and then determine the relationship between that ...
  • Development of a Sinkhole Risk Evaluation Program Summary
    Development of a Sinkhole Risk Evaluation Program [Summary]
    Horhota, David ;
    Nam, Boo Hyun
    2018-11-01 | PDF
    Florida is one of the most sinkhole-active areas in the United States, and sinkholes can sometimes cause severe damage to homes, roads, or other infrastructure. Sinkholes form when groundwater interacts with underlying deposits of soluble, porous, carbonate limestone causing dissolution and creating cavities. Overlying soils begin to fill these cav ...
  • Strengthening of Existing InvertedT Bent Caps Volume 1 Preliminary Design
    Strengthening of Existing Inverted-T Bent Caps -- Volume 1: Preliminary Design
    Hurlebaus, Stefan ;
    Mander, John B.
    2018-11-01 | PDF
    Inverted-T bent caps are used extensively throughout Texas to economically satisfy geometric constraints. Since the design approach has changed and the traffic volume has increased over the decades, evaluation of existing inverted-T bent caps is needed. The research objectives were to assess in-service inverted-T bent caps based on field visits and ...
  • 3M Wet Reflective Ceramic Elements and Potters Visimax Plus New Bead Technology for Added Retroreflectivity in All Weather Pavement Markings
    3M Wet Reflective Ceramic Elements and Potters Visimax Plus: New Bead Technology for Added Retroreflectivity in All Weather Pavement Markings
    Abernathy, Craig
    2018-11-01 | PDF
    This project evaluated the effectiveness of 3M Ceramic Elements and Potters VISIMAX Plus when blended with conventional Montana Department of Transportation (MDT) Type 2 glass beads in highway pavement markings. These elements are claimed to provide increased retroreflectivity during wet conditions allowing states to recess a 20 mil thick striping ...
  • Reducing Airport Pollution and Consequent Health Impacts to Local Community
    Reducing Airport Pollution and Consequent Health Impacts to Local Community
    Tang, Hualong ;
    Zhang, Yu
    2018-10-31 | PDF
    Research shows that air pollution caused by a large airport could be equivalent to that produced by many hundreds of miles of freeway traffic. Airplane air pollution include ultrafine sulfur dioxide, nitrogen oxide and other toxic particles, which not only affect employees and passengers on airport and residents near airport but could spread to as ...
  • Peak Spreading Tool Implementation
    Peak Spreading Tool Implementation
    Searcy, Sarah ;
    Aghdashi, Behzad
    2018-10-31 | PDF
    North Carolina Department of Transportation's (NCDOT’s) Transportation Planning Division (TPD) seeks to utilize a tool to estimate the impact of peak spreading based on capacity constraints that is found in the latest national guidance for traffic forecasting in NCHRP 765. A previous research project (NCDOT 2017-24) synthesized information about ho ...
  • Florida Aviation Activity Forecast Methodologies and Tools Development
    Florida Aviation Activity Forecast Methodologies and Tools Development
    Zhang, Yu ;
    Wu, Zhiqiang
    2018-10-31 | PDF
    Aviation activity forecast is a necessary tool in airport planning and financing decisions. It provides inputs for understanding commercial and financial requirements and for decision making in defining future capacity and operational strategies. Accurate forecasts drive appropriate investment policy that will lead to effective investment return an ...
  • Development of a Bicycle Dynamic Model and Riding Environment for Evaluating Roadway Features for Safe Cycling
    Development of a Bicycle Dynamic Model and Riding Environment for Evaluating Roadway Features for Safe Cycling
    Attanayake, Upul ;
    Keil, Mitchel
    2018-10-31 | PDF
    Cycling is a viable transportation option for almost everyone and enhances health, equity, and quality of life. Cycling contributes to the society by reducing fuel consumption, traffic congestion, and air and noise pollution. In recent days, cycling has been promoted as more emphasis is given to non-motorized mobility. To attract people towards cyc ...
  • InService Performance Evaluation of Erosion Prevention and Sediment Control EPSC Devices
    In-Service Performance Evaluation of Erosion Prevention and Sediment Control (EPSC) Devices
    Schwartz, John S ;
    Hathaway, Jon M
    2018-10-31 | PDF
    Erosion Prevention and Sediment Control (EPSC) devices are widely used during construction projects by Department of Transportations (DOTs) nationally to prevent or reduce the movement of sediment that is carried into lakes, streams and rivers by storm water runoff from a site during construction and are required by state water quality and storm wa ...
  • An Intersection Database Enhances Blind Pedestrians Access to Complex Signalized Intersections Stage 2 Analysis Database Development
    An Intersection Database Enhances Blind Pedestrians' Access to Complex Signalized Intersections: Stage 2 Analysis & Database Development
    Guth, Dave ;
    Barlow, Janet
    2018-10-22 | PDF
    Cycling is a viable transportation option for almost everyone and enhances health, equity, and quality of life. Cycling contributes to the society by reducing fuel consumption, traffic congestion, and air and noise pollution. In recent days, cycling has been promoted as more emphasis is given to non-motorized mobility. To attract people towards cyc ...
  • Stormwater Analysis and Water Quality Assessment of Urban Areas
    Stormwater Analysis and Water Quality Assessment of Urban Areas
    Liang, Xu ;
    Lin, Jeen-Shang
    2018-10-13 | PDF
    Salt is widely used for road deicing purpose in winter, and salt application could raise stream chloride level and leads to deterioration of water quality. This study represents the first steps toward developing a comprehensive understanding of how the streams chloride levels are impacted by the salt operation. Toward this goal, this study develope ...
  • Evaluating Safety and Economic Impacts of Texas Travel Information Centers
    Evaluating Safety and Economic Impacts of Texas Travel Information Centers
    Murphy, Mike ;
    Han, Zhe
    2018-10-12 | PDF
    Senate Bill 1, passed in 2017 during the 85th Legislature Regular Session, contained Rider 32. This bill requires the Texas Department of Transportation (TxDOT) to publish a report by November 1, 2018, describing the economic and safety impacts of travel information centers (TICs). TICs are believed to have positive impacts on travelers’ safety. Ho ...
  • Quick Response New England Connected and Autonomous Vehicles
    Quick Response: New England Connected and Autonomous Vehicles
    Chaffee, Chris ;
    Murtha, Suzanne
    2018-10-10 | PDF
    Regional coordination in anticipation of the widespread use of connected vehicles/autonomous vehicles (CVs/AVs) will better educate New England’s population, influence policy, reduce costs, and provide safer and more efficient roadways for the traveling public. This document provides considerations for identified cross-border issues and a roadmap f ...
  • The Impact of Connected Vehicle Market Penetration and Connectivity Levels on Traffic Safety in Connected Vehicles Transition Period [supporting datasets]
    Abdel-Aty, Mohamed ;
    Wang, Ling
    2018-10-08 | ZIP
    The recent advent of connected vehicles (CV) technologies could bring unprecedented opportunities to improve road safety, especially under reduced-visibility conditions. Reduced-visibility conditions increase the probability of rear-end crash occurrences and their severity. Moreover, slow traffic may be formed due to bottlenecks on freeways. This p ...
    Dataset
  • Enhancing School Zone and School Bus Safety [supporting datasets]
    Lee, Jaeyoung ;
    Abdel-Aty, Mohamed
    2018-10-08 | ZIP
    Safety issues in school zone areas have been one of the most important topics in the traffic safety field. This research project assesses the safety effects of different roadway countermeasures in school zone areas. Although many studies have evaluated the effectiveness of various traffic control devices (e.g., sign, flashing beacon, speed monitori ...
    Dataset Supporting Files
  • An Assessment of Traffic Safety Between Drivers and Bicyclists Based on Roadway Cross-Section Designs and Countermeasures Using Simulation [supporting dataset]
    Cai, Qing ;
    Abdel-Aty, Mohamed
    2018-10-08 | ZIP
    Cycling is encouraged in countries around the world as an economical, energy-efficient, and sustainable mode of transportation. Simulation is an important approach to analyzing the safety of cycling by identifying the effects of different factors. To ensure the success of a simulation study, it is essential to know the factors that have significant ...
    Dataset
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