- ...that Interstate 75 (pictured crossing the Mackinac Bridge) is the only highway that exists on both the Upper and Lower peninsulas of Michigan?
- ...that the construction of the Hampstead Bypass along Maryland Route 30 was delayed in the 1990s due in part to a habitat of bog turtles?
- ... that U.S. Routes within Washington state currently make up about 1,800 miles (2,900 km) of the Washington highway system?
- ...that the only state-numbered highways shorter than one mile (1.6 km) in the Massachusetts highway system are Route 15 and Route 108, which are extensions of the same-numbered highways in Rhode Island and New Hampshire, respectively?
- ... that Mississippi Highway 198 is the designation given to former alignments of U.S. Highway 98 in the state?