- ...that at 1,328 feet (405 m) above sea level, Brockway Mountain Drive (scenic overlook pictured) in the Upper Peninsula is one of the highest roads between the Rockies and Alleghenies?
- ... that the former M-108 in Mackinaw City was once a rare "three-legged route" connecting the State Highway Ferry Docks with the Fort Michilimackinac State Historic Park and US 31?
- ... that the M-64 highway designation was moved twice in two years by exchanging the number with different roads?
- ... that the section of Michigan Avenue in East Lansing is an unsigned highway numbered M-143?
- ... that a section of the former Bus. M-28 in Newberry has also carried the designations M-28, M-48, M-117 or M-123 at different times in its history?
- ...that at 1,328 feet (405 m) above sea level, Brockway Mountain Drive (scenic overlook pictured) in the Upper Peninsula is one of the highest roads between the Rockies and Alleghenies?
- ... that the former M-108 in Mackinaw City was once a rare "three-legged route" connecting the State Highway Ferry Docks with the Fort Michilimackinac State Historic Park and US 31?
- ... that the M-64 highway designation was moved twice in two years by exchanging the number with different roads?
- ... that the section of Michigan Avenue in East Lansing is an unsigned highway numbered M-143?
- ... that a section of the former Bus. M-28 in Newberry has also carried the designations M-28, M-48, M-117 or M-123 at different times in its history?