 The highway opened to traffic on October 30, 2015, and the total cost for M-231 was estimated at $180 million.In early 2020, local homeowners received notices related to potential zoning changes in Zeeland Township related to a proposed southern extension of M-231 between M-45 and I-196.At the time, MDOT did not have funding nor a timeline for such an extension, although they identified a potential corridor to local media.