How effective are radar speed signs? Speed radar sign effectiveness are a proven traffic calming solution to raise the speed awareness of oncoming drivers. Studies repeatedly show that when alerted by a radar sign or trailer, speeders WILL slow down up to 80% of the time. Typical average speed reductions are 10-20%, and overall compliance with the posted speed limit will increase by 30-60%.
Decline in Average Speeds
After 21 months of operation, the radar speed sign continues to be effective in reducing the average speeds in a 25MPH neighborhood cut-through street.
Average Vehicle Speeds: By MPH Segments
Shift of Peak Speeds to Lower Speeds
Six months of operation of a radar speed sign on a neighborhood cut through street demonstrates the effectiveness of the sign in lowering peak speeds to lower speeds.
Peak Speed Shifts: By MPH Segments
Speed Limit Compliance At Plant Entrance
1.5 years of radar speed sign operation at a plant entrance shows 55% more vehicles obeying posted speed limit (PSL).
Speed Radar Signs Reduced Speeding At Plant By 55%!
Long Term Reduction In Speeding Drivers
2 years of operation on a 40 MPH arterial street shows consistent, long-term reduction of speed.
Percent of Vehicles Speeding
Long Term Reduction In Average Speeds
2 years of radar sign operation on a 40 MPH arterial street shows average speeds maintain drop of 3.5 MPH.
Weekly Average Speeds