Rose Hammond pushed authorities for years to lower the 55 mph speed limit on a two-lane road that passes her assisted living community, a church, two schools and a busy park that hosts numerous youth sports leagues.

“What are you waiting for, somebody to get killed?” the 85-year-old chided officials in northwest Ohio, complaining that nothing was being done about the motorcycles that race by almost daily.

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Amid growing public pressure, Sylvania Township asked county engineers in March to analyze whether Mitchaw Road's posted speed is too high. The surprising answer: Technically, it's 5 mph too low.

The reason dates back to studies on rural roads from the 1930s and 1940s that still play an outsized role in the way

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