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A decades-old rule lets drivers set speed limits on US roads. That could be changing

Growing safety concerns and a rise in road deaths have prompted states and federal agencies to reconsider the 85% speed limit rule, with studies showing fatality risks increase 8.5% per 5 mph rise on highways.

  • Amid a recent spike in road deaths, the Federal Highway Administration signaled that the 85% rule isn't a binding guideline, prompting states to reconsider their speed limits.
  • The 85% rule, a longstanding guideline, ties posted speeds to the 15th-fastest vehicle out of 100 in rural roadway studies from the 1930s and 1940s.
  • Demonstrating the rule’s impact, the study linked higher speed limits to increased fatalities, as the 85% rule calls for raising the limit to 60 mph, and Seattle’s pilot program saw a 7% drop in 85th percentile speed.
  • Amid growing local concerns, Sylvania Township officials asked county engineers in March to analyze Mitchaw Road’s speed limit, only to learn the guideline supports raising it to 60 mph, surprising leaders.
  • Developing an alternative, the National Association of City Transportation Officials introduced the ‘City Limits’ formula, allowing safety-driven departures from guidelines.
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83 Articles

WBAL-TVWBAL-TV
+18 Reposted by 18 other sources
Center

States rethink setting speed limits based on how fast people drive

Road safety activists and some states are pushing to depart from a norm that bases speed limits largely on how fast drivers actually travel.

·Baltimore, United States
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journalgazette.netjournalgazette.net
+12 Reposted by 12 other sources
Center

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

Road safety activists and some states are pushing to depart from a longstanding rule that sets speed limits in the United States based largely on how fast drivers actually travel. This is due to the 85% rule, which ties speed…

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Spectrum Local NewsSpectrum Local News
+3 Reposted by 3 other sources
Center

Potential change to rule that lets drivers set speed limits on roads

The concept assumes that a road's safest speed is the one most vehicles travel — neither too high nor too low.

·United States
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  • 68% of the sources are Center
68% Center

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The Tribune-Democrat broke the news in Johnstown, United States on Sunday, August 17, 2025.
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