Portal:Michigan highways/Did you know/April 2014

... that M-39 (River Rouge crossing pictured) is better known as the Southfield Freeway?
... that M-95 has been named for Leif Ericson, the Norse explorer?
... that until it was renumbered in the 1930s, M-99 used to be M-9?
... that M-553 used to be County Road 553 in Marquette County?
... that the eastern and western ends of M-21 were replaced by different Interstate Highways?