 The entirety of I-69 is listed on the National Highway System, which is a network of roadways important to the country's economy, defense, and mobility. The freeway carries 91,100 vehicles on average each day between I-475 and M-54 in Flint and 14,085 vehicles between M-53 and Capac Road near the Lapeer – St. Clair county line, the highest and lowest traffic counts in 2012, respectively. I-69 carries the Lake Huron Circle Tour in the Port Huron area and the I-69 Recreational Heritage Route from the Indiana state line north to the Calhoun – Eaton county line.
