SPEED REDUCTION EFFECTS OF CHANGEABLE MESSAGE SIGNS IN A CONSTRUCTION ZONE. PROJECT REPORT

This study evaluated the vehicular speed reduction effects of displaying speed limit and information messages on a changeable message sign (CMS) placed inside the work activity area in a work zone for a one lane closure on a rural interstate highway. It also examined the additional effects of using two CMS devices compared to one CMS. The following three experiments were conducted: (1) One CMS in advance of the work zone (Experiment 1), (2) One CMS inside the work activity area (Experiment 2), and (3) Two CMSs inside the work activity area (Experiment 3). Displaying speed limit and information messages on CMSs placed in the work activity area was effective in reducing the average speed and percentages of vehicles with excessive speeds. Comparing the results from Experiments 2 and 3 indicated that displaying the CMS messages reduced the speed of cars immediately after passing the CMS, but not at a point far from the CMS. Although trucks did not consistently reduce their speeds near the first CMS, trucks traveled at reduced speeds after passing the CMS. Cars and trucks reduced their speeds by as much as 5 and 4 mph, respectively, near the CMS. The speed reduction depended on the travel speed of the vehicles. Placing the CMS in the work activity area was more effective than putting it in advance of the work zone.

  • Record URL:
  • Supplemental Notes:
    • Study title: Investigation of Speed Control Methods in Work Zones.
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  United States  61801-2352

    Illinois Department of Transportation

    Bureau of Materials and Physical Research
    126 East Ash Street
    Springfield, IL  United States  62704-4766

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Benekohal, R F
    • Shu, J
  • Publication Date: 1992-4

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 45 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00627306
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IL/UI-239, UILU-ENG-92-2019
  • Contract Numbers: IHR-014
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 9 1993 12:00AM