As the historic base of the U.S. auto industry, Michigan's intra-state travel system is almost entirely dependent on the internal combustion engine. The most extensive public transit system is the Greyhound bus network, which reaches most population centers in much of the state. (http://www.greyhound.com/...) Amtrak's three daily rail routes from Chicago connect certain cities in southern Michigan see "Get in". Most intra-state air service is out of Detroit Metro; there is no regular service between the state's small regional airports. Several of the larger cities have local bus services Detroit also has light rail, but the personal automobile remains the best way to get around within Michigan. Interstate, US, and state highways permeate southeast Michigan, crisscross the rest of southern Michigan, stretch up into northern Michigan, and trickle across the Upper Peninsula.
