M-2 (Michigan highway)

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What an M-2 reassurance marker/highway shield would look like if the designation were to be used.

M-2 is designation of a proposed state highway in the U.S. state of Michigan. Like all other state highways, or trunklines, its numerical designation is prefixed by M-. As of 2006, this designation is not conclusively known to have been used today.

According to Chris Bessert of Michigan Highways,

I don't believe there ever was a signed M-2. State trunklines began at M-10 and went up from there between 1913 and 1926. When the single-digit routes made their comeback in the 1970s, MDOT skipped M-2 for some reason and it was only the proposed connector in southern Wayne and southeastern Washtenaw counties between I-75 and I-275 and westerly to US-23 from the 1990s that had been potentially assigned the M-2 designation... but that route was permanently shelved quite a few years ago, so I removed it from my site.

I do have a very old State Highway Department map that showed an M-2 in Cheboygan County in the 1930s, but even that map was somewhat self-contradictory and no other source shows such an "M-2" in existence. So, for now, I have to assume it was an error or a proposed designation that never made it into reality.