30 mile per hour speed limit signs every 1/4 mile on a stretch of road that goes past the elementary school where my wife works. Result: everyone knows the speed limit and drives 40-50 mph.
Traffic cameras that automatically issue $40 tickets if you exceed 39 mph were installed. Result: everyone obeys the speed limit and drives 25 – 35 mph.
So, about 40 years of awareness and education training plus periodic enforcement failed to change driving behavior. Installing a technical control with continual monitoring and enforcement changed the behavior in a day.
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