Device name(s): Radar Speed Signs/Speed Displays

Radar Speed Signs or Speed Displays

Approximate Cost: $10,000 – $15,000

Definition: Radar feedback signs display the speed of oncoming vehicles, thereby increasing drivers’ awareness of the speed they are traveling at versus the posted speed limit.  Speed limit signs are posted as a supplement to the radar feedback sign. A permanent electronic radar display device that displays the travel speed of each vehicle approaching the device. By displaying the speed of oncoming vehicles, these signs provide direct feedback to drivers and remind them to slow down.

Fast Facts:

  • Can be used on Local Street- yes
  • Can be used on Collector- yes
  • Can be used on Arterial- yes
  • Reduces Speed- yes
  • Reduces Volume- no
  • Noise Impact- no
  • Restricts Access- no
  • Bicyclist Impact-  no
  • Transit Impact- no
  • Parking Impact-  no
  • Emergency Response Impact- no


  • increases driver awareness of the speed limit
  • can be installed on existing streetlight pole
  • can be quickly installed with little construction
  • shown to be effective at reducing travel speed


  • may lose effectiveness over time
  • maintenance and energy requirements


  • 85th percentile speed is 5 mph above the speed limit or greater