Radar speed signs have shown a dramatic reduction in the speed of vehicles traveling in excess of the speed limit.
Stationary Radar Sign Program Report Bellevue, WA
They [radar speed signs] have proven to be consistently effective at getting drivers to slow down- reducing speeds by about 10%, an effect that lasts for several miles down the road.
Harnessing the Power of Feedback Loops Wired Magazine
Streets where radar signs were installed continued to experience speed reductions months after the signs were installed.
Texas Transportation Institute Texas A&M University
Speed display boards [Radar speed signs] effectively reduce vehicle speed, changing behaviors for the long term.
Journal of the Transportation Research Board NY
In the vicinity of schools where radar speed signs were installed, drivers slowed an average of 14%.
Case study Garden Grove, CA
In West Valley City, UT, the 85th percentile speed was reduced from 37 mph to 31-32 mph after the installation of a radar speed sign.
Case study West Valley City, UT
Up to 70% of speeding drivers slow down at radar signs
Case study Marietta, GA