Three experiments were conducted to evaluate the effectiveness of using drone (passive or unmanned) radar guns on vehicle speeds in construction zones. Experiment 1 was an exploratory study to find the immediate (less than an hour) effects of using one drone radar gun. Experiment 2 was conducted for a longer time period (a few hours) to evaluate the effects of using one drone radar gun. Experiment 3 evaluated the effects of using two drone radar guns and their lasting effects on vehicle speeds. Experiment 3 was divided into three one-hour time intervals. This method was used to determine the lasting effects of drone radar. Data analysis included the comparison of mean speeds, speed dsitributions, percent exceeding a given speed, and net speed reductions. The immediate effects of using one radar gun (Experiment 1) were 8-10 mph speed reductions; however, such reductions should not be considered typical effects of radar signal transmission because of the exploratory nature of Experiment 1. Experiment 2 showed that using a radar gun was not effective in reducing vehicle speeds when drivers knew it was drone radar. Experiment 3 indicated that the use of two radar guns increased the effectiveness of drone radars, since drivers were not sure whether the signals were from a police radar or drone radar. The two radar experiments reduced truck speeds by 3-6 mph and car speeds by 3 mph, and the radar effects did not diminish over time. In Experiments 1 and 3 the percentage of vehicles with excessive speeds inside the work zones decreased when radar signals were transmitted. Furthermore, the decreases in Experiment 3 were sustained over a period of time.

  • 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
    • Resende, PTV
    • Zhao, W
  • Publication Date: 1992-3


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 59 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00627305
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IL/UI-238, UILU-ENG-92-2018
  • Contract Numbers: IHR-014
  • Created Date: Apr 9 1993 12:00AM