Interstate 75 runs from Canada to south Florida, by way of Detroit, Cincinnati, Knoxville, Atlanta, and Tampa.  The narrow channel of water separating Lake Superior from Lake Huron is settled on both sides; the north side of the waterway hosts Sault Sainte Marie, Ontario, Canada, and the south side is settled by Sault Sainte Marie, Michigan, where Interstate 75 begins.  Interstate 75's first objective is to cut south across the eastern end of Michigan's Upper Peninsula. It holds the distinction of traversing the only bridge connecting the Upper and Lower Peninsulas of Michigan, the Mackinac Bridge, from St. Ignace to Mackinaw City.  Interstate 75 runs south and southeast through Flint to Detroit, then southwest to Toledo, Ohio.  (For a more direct route south from Flint to Toledo, use US Route 23's freeway instead!)  In Ohio, Interstate 75 runs south from Toledo through Dayton to Cincinnati, where it crosses the Ohio River into Kentucky.  Next, it passes through Lexington, Kentucky to Knoxville, Tennessee, where the route angles southwest to Chattanooga, Tennessee.  Interstate 75 exits Chattanooga and Tennessee into Georgia, serving Atlanta, Macon, and south-central parts of the state.  After Georgia, Interstate 75 crosses into Florida, where it follows the west side of Florida, along the Gulf of Mexico.  It's the primary highway for accessing Gainesville, Ocala, the Tampa Bay metroplex, Bradenton, Sarasota, Fort Myers, and Naples.  At Naples, Interstate 75 bends eastward onto a tolled section of highway called Alligator Alley, spanning across the southern part of the Florida peninsula. The final interchange on Interstate 75 connects to Florida State Routes 826 and 924, where Hialeah meets Miami Lakes, in Miami's northwestern suburbs.

My photo of an Interstate 75 marker comes from Wildwood, Florida. The sign assembly depicted faces east at the intersection of Florida State Route 44 and US Route 301.  Interstate 75 lies ahead at an interchange, farther into the background of the photo. This photo was taken as part of the second Gulf Coast trip, in November 2016.
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