I bet this would work in Knoxville! Denmark now has topless women holding speed limit signs in areas where speeding is bad.
There is a video as part of a viral campaign by the Danish Road Safety Council.
This movie was made by the Danish Road Safety Council and aims to draw attention to speed signs and speed limits in Denmark. Despite a decrease in speed violations, 7 out of 10 Danes still exceed the speed limit on a regular basis. Respecting the speed limits is the simplest way to save lives. [Source]