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M-121 was a state highway in Flint that provided access to Bishop International Airport from both of the I-69 and I-75/US 23 freeways. It was first designated along its last routing in 1935. It was retired and the road returned to local control in 2003.[1]
- Historical notes: M-121 was also used as the designation of a former routing of US 2 in the Upper Peninsula. In 1935, this route was redesignated as a portion of a new M-5 and the M-121 designation was transferred to Bristol Rd. in Flint.
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