In response to roadway geometry and traffic control devices, motorists may change their speeds within a work zone. Speed profile data were collected for 208 vehicles who traveled a 1.5-mile long section of a work zone, and speed reduction patterns were determined for Autos and Trucks. Four driver categories were identified based on the patterns. About 61% of the drivers reduced their speeds considerably after the first work zone speed limit signs, but nearly 15% of the drivers did not reduce their speeds until they neared the location of construction activities. About 11% of the drivers traveled at consistently high speeds and did not considerably reduce their speeds. The remaining drivers did not display a common pattern. The average speeds of Autos and Trucks were 5-18 mph and 1-12 mph, respectively, over the work zone speed limit. Vehicles decreased their speeds to the lowest level near the work space, but increased them after passing it. Even at the work space, about 65% of Autos and 47% of Trucks traveled faster than the speed limit. Autos and Trucks reduced their speeds by 1-13 mph and 3-12 mph, respectively, compared to their speeds at the beginning of the taper. The speeds at the beginning of the taper were used to group the vehicles into four speed groups. The maximum reduction in the average speed at different locations was greater with greater initial mean speeds; indicating that, on the average, the vehicles with higher initial speeds reduced their speeds more than the vehicles with lower initial speeds. However, the drivers in the higher initial speed groups kept higher speeds in the work zone than the drivers in the lower initial speed groups, even though the former group had greater speed reductions than the latter group.

  • 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
    • Wang, Lin
    • Orloski, R L
    • Kastel, L
  • Publication Date: 1992-6


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 96 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00627308
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IL/UI-241, UILU-ENG-92-2021
  • Contract Numbers: IHR-014
  • Created Date: Apr 9 1993 12:00AM