Visited South Dakota, and (taking a cue from Father of tdaxp) avoided the I-80/I-680/I-229 hubbub in Nebraska and Omaha by traveling from Lincoln to Sioux City on beautiful U.S. Route 77
While writing this short post I came across a website dedicated to the history of the U.S. (non-Interstate) Highway System. The history of the highway sign and the Highway
60 66 Controversy. Check it out.