when was this highway formed?
1970
M-1 (Michigan highway)
Since 1970, it has borne the M-1 designation. 
where was the first paved road in america Woodward Avenue from where does the m-1 start? It is a north–south state trunkline highway in the Metro Detroit area of the US state of Michigan. The highway, called "Detroit's Main Street", runs from Detroit north-northwesterly to Pontiac.
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M-1 (Michigan highway) [SEP] Introduction
When Michigan created the State Trunkline Highway System in 1913, the roadway was included, numbered as part of M-10 in 1919. Later, it was part of US Highway 10 (US 10) following the creation of the United States Numbered Highway System. Since 1970, it has borne the M-1 designation. The roadway carried streetcar lines from the 1860s until the 1950s; a new streetcar line known as the QLine opened along part of M-1 in 2017.