- ... that a proposed Michigan Turnpike (map pictured) would have run through the Detroit area if the State Highway Commissioner did not stall it until the creation of the Interstate Highway System made the proposal obsolete?
- ... although still commonly called Nevada State Route 49 by visitors to Nevada's Black Rock Desert and the Burning Man festival, the highway hasn't been maintained by the state since the 1980s?
- ... that road closures and detours from flood damage along Pennsylvania Route 32 in the 2000s significantly affected businesses, forcing some to close down?
- ... the completion of Interstate 17 shortened the distance of the truck route between Phoenix and Flagstaff, Arizona, by approximately 80 miles (130 km) (versus the former route of U.S. Route 89 between those two cities)?
- ... that Florida State Road 9336 is the only signed four digit state route in Florida?