M-56 (Michigan highway)

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M-56 was a state highway during the late 1960s-early 1970s that replaced the M-21 designation from M-13 to Flint when the M-21 (now I-69) freeway was built.

When the M-21 designation was replaced with the I-69 designation, the M-56 designation was retired and M-21 was restored in its place.

Historical Note: In the 1950s, M-56 was originally numbered on a road from US 25 in Flat Rock to US 112, today US 12, in Canton. Today, this road is known as Huron River Dr. and Belleville Rd.
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