The ability to predict coefficient of retroreflection values for inservice traffic signs is critical for the Federal Highway Administration's (FHWA's) Sign Management System (SMS). Within the SMS, tools for predicting inservice retrorflective performance of traffic signs and for determining the motorist's visual needs are required. The research which focuses on the motorist's needs in terms of traffic sign luminance, legibility distance, conspicuity, etc., is on-going by others. The project reported on here evaluated the effects of climatological and geographic variables on sign sheeting deterioration. A national data collection effort was undertaken. Data samples from 6,275 traffic signs were collected across the country. The data collected included: sheeting retroreflectivity, ground elevation, orientation to the sun, data of installation, sheeting type, etc. Mathematical equations were developed using the key deterioration variables to predict inservice coefficient of retroreflectivity and legend to background contrast ratios. The main difficulty in modeling sheeting deterioration was the result of the variation in the coefficient of retroreflectivity for new sheeting.

  • Corporate Authors:

    Bellomo-McGee, Incorporated

    8330 Boone Boulevard, Suite 700
    Vienna, VA  United States  22182

    Federal Highway Administration

    Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
    McLean, VA  United States  22101
  • Authors:
    • Black, K L
    • McGee, H W
    • Hussain, S F
    • Rennilson, J J
  • Publication Date: 1991-10

Media Info

  • Pagination: 112 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00619205
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-90-101, NCP 3A2A1122
  • Contract Numbers: DTFH61-88-C-00060
  • Files: TRIS, USDOT
  • Created Date: Feb 29 1992 12:00AM