Efficacy of Speed Warning Technologies

Details

• Creators:
  Gates, Timothy J. ; Cavka, Magdalena ; Keshari, Sagar ; Pahari, Sakar ; Savolainen, Peter T. ; Zhao, Dong
• Corporate Creators:
  Michigan State University, Department of Electrical and Computer Engineering
• Corporate Contributors:
  Michigan. Dept. of Transportation. Research Administration ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Driving Behavior Highway Curves Roundabouts Speed Limits Traffic Crashes Traffic Signs Warning Signs
• Publication/ Report Number:
  SPR-1748
• Resource Type:
  Tech Report
• Geographical Coverage:
  Michigan ; United States
• Edition:
  Final Report, 1/23/2023 - 5/15/2025
• Corporate Publisher:
  Michigan Department of Transportation. Research Administration
• Abstract:
  Research was undertaken to determine the effectiveness of various speed warning technologies across a variety of critical speed-change contexts in order to provide guidance to support future installation and operation of such treatments in Michigan. The speed warning technologies evaluated in this research included dynamic speed feedback signs (DSFS), a flashing LED chevron system, a weather-activated slippery curve warning system, and targeted winter weather messages on changeable message signs (CMS). The speed reduction effectiveness of the selected speed warning technologies was assessed through a series of field evaluations performed at 21 highway locations representing various speed-change contexts, which included: freeway exit ramps (DSFS), mainline freeway curves (DSFS), rural highway curves (DSFS, flashing LED chevrons, weather-activated slippery curve warning system), transition from rural highway into a community (DSFS), transition from freeway to non-freeway (DSFS), and at bridges susceptible to winter icing (CMS messaging). The messaging strategies, warning alerts, and installation positions for each evaluation were selected based on the highway context and warning technology being evaluated. Speeds of free-flowing vehicles were tracked using LIDAR under existing baseline conditions and after the installation of the specified sign treatments. The primary measure of effectiveness was the speed reduction for each test sign condition compared to the existing signing.
• Format:
  PDF
• Funding:
  2023-0135, OR23-010
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f78778e4bccc1e24cf383f377426e176fab9a9541d28780885196a6a559037422a4f78e894f30b0d75230901141591d5e269ce6c893e84fdc790e2063decb8eb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/85658/dot_85658_DS1.pdf
• File Type:
  [PDF - 11.39 MB ]