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Four women travelling in a Mini Cooper
Department of Transportation


Did you know that the Michigan Department of Transportation is responsible for Michigan’s nearly 10,000-mile state highway system (M, I, and US-routes)? In fact, it is the backbone of Michigan’s 120,000-mile highway, road and street network. So, whether you are a daily commuter, business owner, or tourist exploring the state, you and millions of other road users depend on Michigan's transportation system every day.

Learn more about traveling efficiently and safely throughout Michigan. 

Traffic & Safety

At MDOT, safety is paramount. It is our goal to improve overall safety for all road users, internal staff, contractors performing work on roads, and emergency responders.


Our goal is to keep Michigan's motorists safe, informed, and mobile. That is why MDOT offers many ways to help ease the stress of commuting by providing information that commuters want and need as they make daily travel decisions.


Did you know that millions of people visit the Great Lakes State every year? Whether you are from out of state or right here in Michigan, we want to ensure your travel throughout Michigan is informative, comfortable, and fun.


Every year, MDOT produces an updated version of the state transportation map. The department also produces numerous geographic information system maps to assist commuters, tourists, and businesses.

Bridges & Crossings

In Michigan, there are three publicly-owned and operated bridges: Mackinac Bridge, Blue Water Bridge, and International Bridge. There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel.