Ah, so it's not legal definitions that make street signs show distances in miles and speeds in miles per hour? And if it's indeed the law since 1875, we wouldn

Ah, so it's not legal definitions that make street signs show distances in miles and speeds in miles per hour? And if it's indeed the law since 1875, we wouldn't have needed the Metric Conversion Act from 1975, would we? We're still on Imperial units because the U.S. commitment to metric units has been patchy and haphazard since the beginning. Unless we're willing to mandate the use of metric units only for all state business, especially in education, we're going to be stuck with furlongs per fortnight.