Advanced Methods for Mobile Retroreflectivity Measurement on Pavement Marking

This project will develop and demonstrate the use of a prototype mobile unit for rapid and reliable measurement of pavement marking retroreflectivity. The project is being carried out in two stages. Work in Stage 1 will focus on designing and building a prototype laboratory unit capable of measuring retroreflectivity from sample strips. The unit will consist of a retroreflectivity measurement system, tracking system, geometry measurement system, neural network system, and speed simulator system. The unit will be capable of simulating measurements under various conditions such as vehicle dynamics, road gradient, and temperature variation. The evaluation criteria for the system will include accuracy and repeatability of retroreflectivity measurements on small strips. Work in Stage 2 will involve assembling and testing the mobile retroreflectivity unit mounted on a vehicle. The tasks to be completed will include designing and building the mounting mechanisms, selecting electrical power source and control, obtaining approval for laser safety, and developing calibration procedure. An extensive evaluation of the mobile unit will be performed at the Iowa State University's Center for Transportation Research and Education to establish reliability and accuracy of the system. Measurements using a hand-held LTL-X will be compared with the mobile unit's results. The final unit will include all the necessary features such as operator interface, data reporting, calibration and verification procedures, and incorporation of measurement data to other systems. The final report will provide guidelines and specifications for using the mobile retroreflectivity unit in the field and plans for its implementation by highway agencies.


  • English


  • Status: Completed
  • Contract Numbers:

    Project 20-30, IDEA

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Jawed, Inam

  • Start Date: 20091027
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 24032

Subject/Index Terms

Filing Info

  • Accession Number: 01547238
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 20-30, IDEA
  • Files: TRB, RiP
  • Created Date: Dec 4 2014 1:00AM