Now showing items 202-221 of 360

  • Laboratory Tests for Hot-Mix Asphalt Characterization in Virginia 

    Gerardo W. Flintsch; Imad L. Al-Qadi; Amara Loulizi; David Mokarem (Virginia Center for Transportation Innovation and Research, 2005-06)
    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 ...
  • Lateral And Longitudinal Grip Variation 

    Woodward, D.; Millar, P. (2012)
    Longitudinal measurement of wet skid resistance is used in many countries to manage the safety of its highway asset. The effect of aggregate type/size, asphalt type / age, degree of trafficking, climate, corners, braking ...
  • Latest Development in the Processing of Pavement Macrotexture Measurements of High Speed Laser Devices 

    Katicha, Samer; Mogrovejo, Daniel E.; Flintsch, Gerardo W.; de León Izeppi, Edgar; Carrasco, Daniel M. (2015-06-04)
    Pavement macrotexture is an important property that affects tire-pavement interactions like friction, tire pavement noise, splash and spray, and rolling resistance. Macrotexture measurement is generally divided into two ...
  • LiDAR: Another Potential Data Source 

    Harwood, L. C.; Doerzaph, Zachary R. (2014-08-25)
  • Life cycle cost analysis to identify the need for drainage renewal in maintenance of road asset: Case Studies from a New Zealand road network 

    Mia, Mohammad N. U.; Henning, Theunis F. P.; Costello, Seosamh B.; McKegg, Campbell (2015-06-04)
    This paper presents life cycle cost analysis case studies of drainage improvements in pavement renewal sections. The methodology used was developed by the New Zealand Transport Agency (NZTA) and utilizes Net Present Value ...
  • 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 ...
  • Linear Regression Crash Prediction Models : Issues and Proposed Solutions 

    Rakha, Hesham A.; Arafeh, Mohamadreza; Abdel-Salam, Abdel-Salam Gomaa; Guo, Feng; Flintsch, Alejandra M. (Virginia Tech. Virginia Tech Transportation Institute, 2010-05)
    The paper develops a linear regression model approach that can be applied to crash data to predict vehicle crashes. The proposed approach involves novice data aggregation to satisfy linear regression assumptions namely ...
  • Live Stop-Controlled Intersection Data Collection 

    Doerzaph, Zachary R.; Neale, Vicki L.; Bowman, J. R.; Weig, K. I. (Virginia. Department of Transportation, 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 ...
  • Live Stop-Controlled Intersection Data Collection 

    Zachary R. Doerzaph; Vicki L. Neale; Jodi Bowman; Kendra Wiegand (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 ...
  • Long-Term Pavement Performance (LTPP) InfoPave: Extracting Practical Information out of the Data 

    Ahmad, Riaz; Daleiden, Jerome; Kargah-Ostadi, Nima (2015-05-20)
    Long-Term Pavement Performance (LTPP) InfoPave is the web interface for the world's largest pavement performance database. This web interface is being developed under the Federal Highway Administration (FHWA) LTPP program ...
  • Long-Term Pavement Performance Automated Faulting Measurement 

    Agurla, Mahesh; Lin, Sean (2015-06-04)
    This study focused on identifying transverse joint locations on jointed plain concrete pavements (JPCP) using an automated joint detection algorithm and computing faulting at these locations using Long-Term Pavement ...
  • Luminance metrics for roadway lighting 

    Meyer, Jason E.; Gibbons, Ronald B. (Ronald Bruce) (Virginia Tech Transportation Institute, 2011-03-25)
    The focus of the current study is the comparison of multiple contrast metrics... The images of pedestrians from a previous nighttime research study were used for analysis. The pedestrians were clothed in both denim and ...
  • Maintaining Airport Pavement Friction Using Surface Densification 

    Gransberg, Douglas D.; Pittenger, Dominique M. (2015-06-04)
    Pavement structures are an airport's “greatest asset and greatest liability”. As a result, preserving airport pavements is not only the most logical but also the most economical solution because preservation focuses on ...
  • The Management Of Skid Resistance In Australia – A National, State Or Local Task? 

    Hillier, P. (2012)
    It is widely recognised that providing appropriate levels of skid resistance and surface texture across a road network can make a valuable contribution in securing positive road safety outcomes. Yet, the proactive management ...
  • Managing Missing Pavement Performance Data in Pavement Management System 

    Farhan, Javed; Fwa, Tien F. (2015-05-01)
    Missing data in pavement condition and performance records of pavement management systems (PMS) are ubiquitous in practice. Imputation of missing data is often required in the analysis of pavement performance and decision ...
  • Market Guide to Fleet Telematics Services: Creating a Consumer's Guide to Currently Available Aftermarket Solutions 

    Trimble, Tammy Elizabeth; Bowman, Darrell Scott, 1969- (Virginia Tech Transportation Institute, 2012-12-21)
    This report documents an effort to review the currently available, aftermarket telematics solutions. The project involved: (a) a survey of the current telematics market; (b) a review of the available telematics systems; ...
  • Matching GPS Records to Digital Map Data: Algorithm Overview and Application 

    McLaughlin, Shane B.; Hankey, Jonathan M. (National Surface Transportation Safety Center for Excellence, 2015-03-03)
    Records of latitude and longitude pairs describing an approximate path of travel are logged by many types of Global Positioning System (GPS)-enabled devices. These logs of latitude/longitude (lat/lon) pairs specify geographic ...
  • Maximise levels of service using cross-asset portfolio renewals management 

    Mason, Michael; Rangamuwa, Siri; Henning, Theunis F. P. (2015-06-04)
    Auckland Transport is tasked with managing its road and public transport assets in the most cost-efficient manner to deliver levels of service and manage risk across the asset portfolio. The renewals approach outlined in ...
  • Measures of Pavement Performance Must Consider the Road User 

    Hudson, W. Ronald; Haas, Ralph; Perrone, Eric (2015-06-04)
    In 1960, Bill Carey and Paul Irick developed the Present Serviceability Index (PSI) as a user-based performance measure to define pavement quality and failure at the AASHO Road Test, a controlled load experiment that cost ...
  • Measuring Pavement Condition Data for a Long-term Pavement Performance Study on New Zealand Roads 

    Brown, Douglas N. (2015-06-04)
    New Zealand like most countries has "site specific" factors which influence pavement performance, some of which are not well investigated or covered in current pavement deterioration models. Apart from the wide variation ...