The United States and the metric system are like oil and water; they don't mix. But that hasn't stopped us from trying. Beginning in the 1970s and continuing into the 1990s, the United States would occasionally attempt to sign highways in metric units at different times. Chapter 1: The 1970s America's first modern foray into metric signs quietly occurred in 1971 in Huntsville, Alabama. 268 metric speed limit signs were placed throughout the city, courtesy of the metrication committee at Marshall Space Flight Center. (1) Between 1971 and the passage of the Metric Conversion Act of 1975, a few states took the lead in marking highways in metric. In 1973, Ohio became the first state to place metric signs along Interstate highways. Starting with four signs in February, Ohio had at least 60 metric signs up along Interstate highways by the end of the year, including a 30-mile stretch of Interstate 75 between Dayton and Cincinnati. (2) In 1973, Ohio was ...
Because every road has a story.