Now showing items 226-245 of 391

    • 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), VTRC 05-CR22
      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, Leslie C.; Doerzaph, Zachary R. (Zachary Richard) (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. (Zachary Richard); Neale, Vicki L.; Bowman, Jodi; Wiegand, Kendra (Virginia Center for Transportation Innovation and Research, 2007-12), VTRC 08-CR2
      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. 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 E.; Bowman, Darrell Scott, 1969- (Virginia Tech. 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 ...
    • Method for identifying rural, urban, and interstate driving in naturalistic driving data : final report 

      Cannon, Brad R.; McLaughlin, Shane B.; Hankey, Jonathan M. (Virginia Tech. Virginia Tech Transportation Institute, 2009-03-12)
      By employing the functionality of GIS, code was written which allows for an automated process to compare the GPS data recorded in the naturalistic driving data with geographic map data from the U.S. Census Bureau and road ...