States rethink a long-held practice of setting speed limits based on how fast drivers travel
Briefly

Authorities in Sylvania Township, influenced by public pressure, evaluated the speed limit on Mitchaw Road, finding it is 5 mph too low despite concerns for safety in a busy area. Established from outdated 1930s rural studies, the 85% rule ties posted speed limits to the speed of the 15th-fastest vehicle. Many states are now reconsidering this method as it leads to a cycle of increased speeding, prompting discussions on new guidelines like the 'City Limits' approach for setting safer speed limits.
A growing public pressure in northwest Ohio prompted Sylvania Township to ask county engineers to analyze the speed limit on Mitchaw Road, revealing it is technically 5 mph too low.
The 85% rule, originating from studies on rural roads in the 1930s and 1940s, suggests setting speed limits based on the 15th-fastest vehicle's travel speed.
Read at Boston.com
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