In Michigan, state highways are designated with an M followed by a number. So you would say M-1 if you were referring to Woodward Avenue. The only other state to designate their highways this way is Kansas.
M-119 is a highway that stretches from Petoskey to Cross Village and in my opinion is probably one of the more beautiful stretches of road in the state. It's very winding in spots and the trees almost come right to the edge. It used to be almost entirely wooded...but progress has changed that a little bit.
State Highway Signs in Michigan are a white diamond bordered by black (they used to be just white diamonds). This is part of the highway.
This is a better idea of what it looks like.
The yellow sign indicating the curves.
Some birch trees.