- ...that a section of the Pennsylvania Turnpike was abandoned (pictured) after the road was relocated to bypass the Rays Hill and Sideling Hill tunnels in 1968?
- ...that two rest areas along Interstate 80 in New Jersey were shut down in 1982 due to chronic use for homosexual activities?
- ... that M-38 was previously a part of M-35 that was 65 miles (105 km) away from the rest of the highway?
- ...that Florida State Road A1A was renumbered from State Road 1 in 1946 in order to reduce confusion with nearby U.S. Route 1?
- ...that the former alignment of U.S. Route 80 in California was designated as a state historic route called Historic U.S. Route 80 in 2006?