- ... that Blue Ridge Parkway (pictured) was built as a part of the New Deal?
- ... that M-49 is the only state highway in Michigan that connects to a like-numbered route in another state, in this case Ohio State Route 49?
- ... that Pennsylvania Route 321 was designated to provide access to the recreational area around the Allegheny Reservoir?
- ... that California State Route 49 is so numbered to honor the California gold rush of 1849, that occurred along the areas served by the highway?
- ... that much of the current alignment of Maryland Route 413 follows a former Pennsylvania Railroad line into Crisfield?