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US 31 begins in Mackinaw City, Michigan and follows the eastern shore of Lake Michigan south to Benton Harbor where it leaves the lakeshore to head south into Indiana. It continues south through central Indiana passing through Indianapolis on its way to Louisville, Kentucky. US 31 splits into US 31E and US 31W in Louisville. The routes cross the border into Tennessee separately, and then recombine in Nashville. US 31 continues south through Tennessee into Alabama, where it passes through Birmingham and Montgomery before heading southwest towards the Gulf of Mexico. US 31 ends near the eastern shore of Mobile Bay in southern Alabama.

We traveled US 31 from Michigan to Alabama in September 2003, taking these photographs along the way. When the route split in Kentucky and Tennessee, we followed US 31E.

• More details about our trip can be found here. (under construction)
• Take at trip down US 31 by viewing a slideshow of the route.
• View individual pictures of US 31.
• Learn about how the alignment of US 31 has changed since it was originally commissioned.
• Information about the ends of US 31 can be found here on the www.usends.com website.
• Historical information about places along US 31 can be found here. (under construction)
• Some additional photos of US 31 in Indiana can be found here on the Indiana Highway Ends website.

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