Getting people to abide by new speed limits isn?t easy. A 1996 study by the National Motorists Association suggests that drivers will adjust their velocities only slightly in response to new legal strictures. In a study of 22 states where speed limits were either raised or lowered by five, 10, 15, or 20 miles per hour, researchers found that cars? average velocities did change, but by less than two miles per hour. Rather than the tempo of travel, shifting road regulations altered the rate of compliance: Violations of the speed limit increased when limits were lowered, and decreased when limits went up.
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