When the remainder of the freeway for I-75 was completed between Roscommon and West Branch in 1973, M-18 was rerouted at Roscommon to run northeasterly over the routing of M-144, a highway that had existed since 1940.
The construction of I-75 between Roscommon and West Branch in 1973 resulted in a shift in the route of M-18, which was redirected to follow the path of M-144, a highway that had been operational since 1940.