Metric signs in Ohio I-71 These signs along I-71 in Ohio, installed on 12 February 1973, are believed to be the first such signs in the US (see this Cincinnati Enquirer article). The signs between Columbus and Cleveland no longer exist—victims of a road widening project; we donβt know whether the signs between Columbus and Cincinnati still exist. Photos courtesy of the Ohio Department of Transportation. Restaurants Metric-oriented restaurant signs. Photo on the left of La Caille restaurant in Salt Lake City, UT courtesy of USMA member Jim Elwell. Photo on the right courtesy of USMA member Joe Mayer, the owner of the White Oaks Restaurant in Westlake, OH (a western suburb of Cleveland, OH). Both signs appeared in the November/December 2002 issue of Metric Today. Last updated: 2015-11-17