Now showing items 21-40 of 497

    • Field and Modeling Framework and Case Study of Truck Weigh Station Operations: Final report 

      Katz, Abryan J.; Rakha, Hesham A. (Virginia Tech. Virginia Tech Transportation Institute, 2002-01)
      Weigh-in-Motion (WIM) systems improve the capacity of weigh station operations significantly by screening trucks while traveling at high speeds and only requiring trucks within a threshold of a maximum permissible gross ...
    • Task 1 Report for the National Highway Traffic Safety Administration: Identification and trade study analysis of alternative rear signaling systems 

      Lee, Suzanne E.; Wierwille, Walter W.; Klauer, Sheila G. (United States. Federal Highway Administration, 2002-03)
      Rear-end crashes are the most frequently occurring type of collision, accounting for approximately 29% of all crashes and resulting in a substantial number of injuries and fatalities each year. Rear-end collisions in which ...
    • Case study evaluation of the Virginia Department of Transportation's I-81 ITS program 

      Baker, Stephanie Ann (United States. Federal Highway Administration, 2002-03-15)
      The primary goal of this report is to provide information to the Sponsors, Policy Committee, and Management of the I-81 ITS Program that may improve the Program. In order to do this, the report focuses on the development ...
    • Historical Development of the Travel Shenandoah Pilot Service 

      Baker, Stephanie Ann; Hintz, Rewa; Trimble, Tammy E. (United States. Federal Highway Administration, 2002-05)
      The purpose of this report is to document the historical development of the Travel Shenandoah pilot project. This report will not attempt to describe in detail the entire five-year history; rather it will focus on the major ...
    • Evaluation of Service Reliability Impacts of Traffic Signal Priority Strategies for Bus Transit 

      Chang, James (Virginia Tech, 2002-06-03)
      Recent progress in technology has facilitated the design, testing, and deployment of traffic signal priority strategies for transit buses. However, a clear consensus has not emerged regarding the evaluation of these ...
    • Reducing fog-related crashes on the Afton and Fancy Gap Mountain sections of I-64 and I-77 in Virginia 

      Lynn, Cheryl; Schreiner, Christopher S.; Campbell, Ross (Virginia Center for Transportation Innovation and Research, 2002-10)
      The Fancy Gap and Afton Mountain interstates have a long history of fog-related, multivehicle crashes. Because of its earlier involvement in the installation and evaluation of the original Afton Mountain in-pavement fog ...
    • High-speed texture measurement of pavements 

      McGhee, Kevin K.; Flintsch, Gerardo W. (Virginia Center for Transportation Innovation and Research, 2003-02-01)
      This study was conducted to validate high-speed texture measuring equipment for use in highway applications. The evaluation included two high-speed systems and a new static referencing device. Tests were conducted on 22 ...
    • Using high-speed texture measurements to improve the uniformity of hot-mix asphalt 

      McGhee, Kevin K.; Flintsch, Gerardo W.; de León Izeppi, Edgar (Virginia Center for Transportation Innovation and Research, 2003-05-01)
      This study introduces Virginia's efforts to apply high-speed texture measurement as a tool to improve the uniformity of hot-mix asphalt (HMA) pavements. Three approaches for detecting and quantifying HMA segregation through ...
    • I-81 ITS Program Evaluation Plan 

      Baker, Stephanie Ann; Schroeder, Aaron D.; Rakha, Hesham A.; Hintz, Rewa (United States. Joint Program Office for Intelligent Transportation Systems, 2003-07)
      This document presents the evaluation framework that the Virginia Tech Transportation Institute (VTTI) has prepared for Phase II of the Virginia Department of Transportation's (VDOT) I-81 ITS Model Safety Corridor Program, ...
    • Modernizing bridge safety inspection with process improvement and digital assistance 

      Mills, Thomas H., III; Wakefield, Ronald R. (Virginia Center for Transportation Innovation and Research, 2004-01)
      This research effort was developed to record and analyze the Virginia Department of Transportation (VDOT) bridge/structure inspection processes as an aid to modernizing and automating these inspection processes through the ...
    • Light Vehicle-Heavy Vehicle Interactions: A Preliminary Assessment Using Critical Incident Analysis 

      Hanowski, Richard J.; Keisler, Aysha S.; Wierwille, Walter W. (United States. Federal Motor Carrier Safety Administration, 2004-05)
      Two recently completed on-road, in situ data collection efforts provided a large data set in which to conduct an examination of near-crashes and crashes (critical incidents) that occurred between light vehicles (LV) and ...
    • Wet night visibility of pavement markings :executive summary 

      Gibbons, Ronald B. (Ronald Bruce); Hankey, Jonathan M.; Pashaj, Irena (Virginia Center for Transportation Innovation and Research, 2004-10)
      This executive summary describes an investigation into the performance of pavement markings in wet night conditions. The performance of a typical pavement marking will degrade when it gets wet. This is a result of the ...
    • Wet Night Visibility of Pavement Markings 

      Gibbons, Ronald B. (Ronald Bruce); Hankey, Jonathan M.; Pashaj, Irena (Virginia Center for Transportation Innovation and Research, 2004-10)
      This report describes an investigation into the performance of pavement markings in wet night conditions. The performance of a typical pavement marking will degrade when it gets wet. This is a result of the flooding of the ...
    • Enhanced Night Visibility Series, Volume XIII Phase III - Study 1: Evaluation of Discomfort Glare During Nighttime Driving in Clear Weather 

      McLaughlin, Shane B.; Hankey, Jonathan M.; Dingus, Thomas A. (United States. Federal Highway Administration, 2005)
      Phase III-- Study 1 was performed to further explore findings on far infrared (FIR) systems from Phase II, to investigate near infrared (NIR) and high intensity discharge (HID) technologies, and to investigate detection ...
    • Field Investigation of High Performance Pavements in Virginia 

      Flintsch, Gerardo W.; Al-Qadi, Imad L.; Loulizi, Amara; Samer Lahouar; McGhee, Kevin K.; Trenton Clark (Virginia Center for Transportation Innovation and Research, 2005-01-01)
      This study evaluated 18 pavement sections located in high-traffic highways in Virginia to find a premium pavement design with a life span of 40 years or more using current and past field experience. The selected pavement ...
    • Ground-Penetrating Radar Calibration at the Virginia Smart Road and Signal Analysis to Improve Prediction of Flexible Pavement Layer Thicknesses 

      Al-Qadi, Imad L.; Samer Lahouar; Loulizi, Amara (Virginia Center for Transportation Innovation and Research, 2005-01-01)
      A ground-penetrating radar (GPR) system was used to collect data over the different pavement sections of the Virginia Smart Road from June 1999 until December 2002. Three antennae at different frequencies were used for ...
    • Laboratory Tests for Hot-Mix Asphalt Characterization in Virginia 

      Flintsch, Gerardo W.; Al-Qadi, Imad L.; Loulizi, Amara; Mokarem, David W. (Virginia Center for Transportation Innovation and Research, 2005-06-01)
      This project reviewed existing laboratory methods for accurately describing the constitutive behavior of the mixes used in the Commonwealth of Virginia. Indirect tensile (IDT) strength, resilient modulus, static creep in ...
    • Fatigue Life Characterization of Superpave Mixtures at the Virginia Smart Road 

      Al-Qadi, Imad L.; Diefenderfer, Stacey D.; Loulizi, Amara (Virginia Center for Transportation Innovation and Research, 2005-08)
      Laboratory fatigue testing was performed on six Superpave HMA mixtures in use at the Virginia Smart Road. Evaluation of the applied strain and resulting fatigue life was performed to fit regressions to predict the fatigue ...
    • Enhanced Night Visibility Series, Volume II: Overview of Phase I and Development of Phase II Experimental Plan 

      Dingus, Thomas A.; Allen, Gary R.; Brich, Stephen C.; Neale, Vicki L.; Schroeder, Aaron D.; Blanco, Myra; Schnell, Thomas; Gillespie, James S.; Schroeder, Tracey T.; Simmons, Carole J.; Hankey, Jonathan M. (United States. Federal Highway Administration, 2005-12)
      The focus of the Phase I effort was on the establishment of performance and design objectives to facilitate the deployment of ultraviolet A (UV-A) headlamps. This report describes the plan to develop UV-A headlamp ...
    • Enhanced Night Visibility Series, Volume XII: Overview of Phase II and Development of Phase III Experimental Plan 

      Hankey, Jonathan M.; Blanco, Myra; Neurauter, M. L.; Gibbons, Ronald B. (Ronald Bruce); Porter, Richard J.; Dingus, Thomas A. (United States. Federal Highway Administration, 2005-12)
      This volume provides an overview of the six studies that compose Phase II of the Enhanced Night Visibility project and the experimental plan for its third and final portion, Phase III. The Phase II studies evaluated up to ...