"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."
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 Established from outdated 1930s rural studies, the 85% rule ties posted speed limits to the speed of the 15th-fastest vehicle.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.
Read at Boston.com
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