Now showing items 1-20 of 42

    • Review and evaluation of models that produce trip tables from ground counts 

      Sivanandan, R.; Narayanan, Arvind; Lei, Peng (Virginia Center for Transportation Innovation and Research, 1996-02)
      This research effort was motivated by the desires of planning agencies to seek alternative methods of deriving current or base year Origin-Destination (O-D) trip tables without adopting conventional O-D surveys that are ...
    • A Method to Enhance the Performance of Synthetic Origin-Destination (O-D) Trip Table Estimation Models 

      Sivanandan, R.; Nanda, Dhruv (Virginia Center for Transportation Innovation and Research, 1998-01)
      The conventional methods of determining origin-destination (O-D) trip tables involve elaborate surveys, e.g., home interviews, that require considerable time, staff, and funds. To overcome this drawback, a number of ...
    • Improvement of Conspicuity of Trailblazing Signs: Phase III-Evaluation of Fluorescent Colors 

      Neale, Vicki L.; Anders, Richard L.; Christopher S. Schreiner; Brich, Stephen C. (Virginia Center for Transportation Innovation and Research, 2001-02)
      This report represents a Phase III effort to design and evaluate a new sign design for incident route trailblazing. The colors evaluated were fluorescent coral, fluorescent purple, fluorescent yellow-green, and non-fluorescent ...
    • Reducing fog-related crashes on the Afton and Fancy Gap Mountain sections of I-64 and I-77 in Virginia 

      Lynn, Cheryl; Schreiner, Christopher; 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 ...
    • 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 ...
    • 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 ...
    • Ground-Penetrating Radar Calibration at the Virginia Smart Road and Signal Analysis to Improve Prediction of Flexible Pavement Layer Thicknesses 

      Imad L. Al-Qadi; 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 ...
    • Field Investigation of High Performance Pavements in Virginia 

      Flintsch, Gerardo W.; Imad L. Al-Qadi; 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 ...
    • Laboratory Tests for Hot-Mix Asphalt Characterization in Virginia 

      Flintsch, Gerardo W.; Imad L. Al-Qadi; 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 ...
    • Transit Signal Priority Project Phase II Field and Simulation Evaluation Results 

      Hesham Rakha; Ahn, Kyoungho (Virginia Center for Transportation Innovation and Research, 2006-03-01)
      Transit Signal Priority (TSP) is recognized as an emerging technology that is capable of enhancing traditional transit services. Basic green-extension TSP was implemented on U.S. Route 1 in the Northern Virginia Area (or ...
    • Intersection Decision Support: Evaluation of a Violation Warning System to Mitigate Straight Crossing Path Collisions 

      Neale, Vicki L.; Perez, Miguel A.; Doerzaph, Zachary R. (Zachary Richard); Lee, Suzanne E.; Stone, Scott; Dingus, Thomas A. (Virginia Center for Transportation Innovation and Research, 2006-04)
      This project entailed the design, development, testing, and evaluation of intersection decision support (IDS) systems to address straight crossing path (SCP) intersection crashes. This type of intersection crash is responsible ...
    • Determination of the In-Place Hot-Mix Asphalt Layer Modulus for Rehabilitation Projects Using a Mechanistic-Empirical Procedure 

      Loulizi, Amara; Flintsch, Gerardo W.; McGhee, Kevin K. (Virginia Center for Transportation Innovation and Research, 2006-07-01)
      This project evaluated the procedures proposed by the Mechanistic-Empirical Pavement Design Guide (MEPDG) to characterize existing hot-mix asphalt (HMA) layers for rehabilitation purposes. Thirty-three cores were extracted ...
    • Pavement Marking Visibility Requirements During Wet Night Conditions 

      Gibbons, Ronald B. (Ronald Bruce) (Virginia Center for Transportation Innovation and Research, 2006-11)
      This study investigated the performance of pavement markings in wet night conditions. Typically, performance will decrease in wet conditions. The degradation is a result of flooding of the marking optics and a change in ...
    • Asphalt Materials Characterization in Support of Implementation of the Proposed Mechanistic-Empirical Pavement Design Guide 

      Flintsch, Gerardo W.; Loulizi, Amara; Stacey D. Diefenderfer; Khaled A. Galal; Diefenderfer, Brian K. (Virginia Center for Transportation Innovation and Research, 2007-01-01)
      The proposed Mechanistic-Empirical Pavement Design Guide (MEPDG) procedure is an improved methodology for pavement design and evaluation of paving materials. Since this new procedure depends heavily on the characterization ...
    • Live Stop-Controlled Intersection Data Collection 

      Doerzaph, Zachary R. (Zachary Richard); Neale, Vicki L.; Bowman, Jodi; Wiegand, Kendra (Virginia Center for Transportation Innovation and Research, 2007-12)
      This report describes an experimental investigation performed at live intersections to gather infrastructure-based naturalistic driver approach behavior data. This data was collected and analyzed with the goal of understanding ...
    • Access Control Design on Highway Interchanges 

      Hesham Rakha; Alejandra Medina Flintsch; Mazen Arafeh; Abdel-Salam Gomaa Abdel-Salam; Dhruv Dua; Abbas, Montasir (Virginia Center for Transportation Innovation and Research, 2008-01-01)
      The adequate spacing and design of access to crossroads in the vicinity of freeway ramps are critical to the safety and traffic operations of both the freeway and the crossroad. The research presented in this report develops ...