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NORTH SIOUX CITY | Three roadside signs are all that remain in Union County of an aborted nationwide campaign to adopt the metric system.

The 1990s push by President George H.W. Bush called for interstate highways to display speed limits not only in miles per hour but also in kilometers per hour. The plan died on the vine, yet the signs remain.

On northbound Interstate 29, just north of the mile marker 4 exit for McCook Lake, a sign shows the speed limit at 75 mph as well as 120 kph. A kilometer is six-tenths of a mile.

On the southbound side of the highway near the same exit, two signs inform motorists that the speed limit has dropped to 65 mph and 105 kph.

Signs with speeds in both measurements are relics rarely seen in the United States.

Stacy Schrunk, of North Sioux City, has driven past the Union County signs for years and never noticed them. Not that it would matter.

"The kph on my speedometer is so small that, honestly, I’ve never paid attention to it," Schrunk said.