 There is no interchange further north for M-72; access to that highway is provided through the business loop.On the north side of Grayling, there is a full interchange for BL I-75/M-93 that provides the southbound I-75 connection to M-72 as well as access from both directions to Hartwick Pines State Park.Crossing into southern Otsego County, I-75 continues northward through Northern Michigan forests.