This study is concerned with the evaluation of real-time changeable message signs that inform motorists of freeway traffic conditions. Included in the study is an evaluation of the use of a letter-grade rating scale for indicating freeway conditions. Evaluation was accomplished through the use of a questionnaire survey and a traffic operations analysis. The study results showed that the changeable message signs were effective in providing information to the motorist. Considerable motorist diversion was noted during analysis incidents which were accompanied by a "LANE BLOCKED" display. The signs were highly visible, generally understood, and useful within the constraints of corridor geometry. Lack of understanding of the letter-grade rating scale employed was attributed to the fact that the scale was not anchored to a readily understandable base. Questionnaire results showed that a vast majority of the respondents found the system useful.

  • Supplemental Notes:
    • Sponsored by the Texas State Department of Highways and Public Transportation; Transportation Planning Division. Research performed in cooperation with the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Stockton, W R
    • Dudek, C L
    • Fambro, D B
    • Messer, C J
  • Publication Date: 1975-8

Media Info

  • Pagination: 109 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00133959
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: TTI-2-18-75-200-1F Final Rpt., FCP 41C3-554
  • Contract Numbers: 2-18-75-200
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jun 23 1976 12:00AM