MDOT is responsible for Michigan’s nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. It is the backbone of Michigan’s 120,000-mile highway, road and street network.

The state owns over 4,700 highway, railroad and pedestrian bridges, 665 miles of railroad track, roughly 2,700 miles of nonmotorized trails, and four airports. Additionally, MDOT administers state and federal transportation programs for aviation, intercity passenger services, rail freight, and local public transit services.