Using Retroreflectivity Measurements to Assist in the Development of a Local Traffic Sign Management Program

This paper reports on a study that was conducted in Hillsborough County, Florida, to assess the impact of proposed federal guidelines regarding sign retroreflectivity on its local traffic program. Hillsborough County used a mobile tracking and data collection system to inventory the county's traffic signs. A statistical sample of retroreflectivity data was collected, which represented a range of physical conditions and classes of county roadway signs. Projected sign replacement costs for the county were calculated. Findings showed that the minimum retroreflectivity values provided by the Federal Highway Administration provide transportation policymakers with objective guidelines for sign replacement. The field research program suggests that Hillsborough County's sign management program database appeared to be quite accurate. The retroreflectometer used in the study was reliable and easy to operate, and software enabled quick downloading of the recorded measurements. As a result of this study, county staff are requesting additional budget funds to replace signs in each failing category in the projected proportion over the next four years. The county will also be implementing a proactive inspection and maintenance program for its traffic signs.

  • Availability:
  • Authors:
    • Rogoff, Marc J
    • Rodriguez, Augusto S
    • McCarthy, Michael B
  • Publication Date: 2005-10


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01010778
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 28 2005 10:20PM