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Interstate Highway from Michigan to Florida

Interstate 75 (I 75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in 5, it is a major cross country, north–south route, traveling from State Road 826 (SR 826, Palmetto Expressway) and SR 924 (Gratigny Parkway) on the Hialeah–Miami Lakes border (northwest of Miami, Florida) to Sault Ste. Marie, Michigan, at the Canadian border. It is the second longest north–south Interstate Highway (after I 95) and the seventh longest Interstate Highway overall. I 75 passes through six different states. The highway runs the length of the Florida peninsula from the Miami area and up the Gulf Coast through Tampa. Farther north in Georgia, I 75 continues on through Macon and Atlanta before running through Chattanooga and Knoxville and the Cumberland Mountains in Tennessee. I 75 crosses Kentucky, passing through Lexington before crossing the Ohio River into Cincinnati, Ohio. In Ohio, the highway runs up the western side through Dayton and Lima before crossing into Michigan north of Toledo. I 75 runs northeasterly along the Lake Erie shoreline and Detroit River into the city of Detroit before turning northwesterly and northward to the Mackinac Bridge where the freeway crosses the strait between Lakes Huron and Michigan. Farther north, I 75 approaches the Canadian border at Sault Ste. Marie, downriver from Lake Superior, 1786.5 mile (2875 km) from its origins near the subtropical Atlantic Ocean.

lengths table|length ref= I 75 does not meet any other freeways until it overlaps I 40 near Farragut and heads eastbound. Together, they enter the outskirts of Knoxville, where I 75 overlaps itself with a different road, this time I 640, but only for a short time. When the two meet I 275, I 75 encounters some of its highest points of elevation through the Cumberland Mountains, cutting through the uppermost peaks and ridges.

I 75 continues northbound through the hilly terrain of the Cumberland Plateau region of Kentucky, passing through London and Richmond and eventually reaching Lexington, where it briefly runs concurrently with I 64 before splitting off in the direction of Georgetown. Afterward, the route heads in the direction of Ohio. Near Walton, I 71 runs concurrently with I 75 for the next 20 mile (32 km) or so and heads toward Cincinnati. The two concurrent Interstates then make an interchange with I 275, the Cincinnati beltway. After passing through Covington, the I 71/I 75 highway traverses the Ohio River via the lower level of the Brent Spence Bridge and continues into Downtown Cincinnati.

Immediately after entering Cincinnati, I 75 diverges from I 71, remaining generally due north through the Cincinnati metro area while I 71 curves more to the east and northeast through downtown Cincinnati and its surrounding suburbs. I 74, Ohio State Route 562, and Ohio State Route 126 all intersect the freeway as it makes its way northward. After another interchange with the I 275 beltway, the freeway continues within the metro area, passing through Middletown and heading toward Dayton, where I 675, I 70, and U. S. Route 35 have interchanges with I 75. The interchange of I 75 with I 70 is known as the Freedom Veterans Crossroads. After exiting the city of Dayton, I 75 makes its way northbound through Ohio, passing through smaller cities of Troy, Sidney, Wapakoneta, Lima, Findlay and Bowling Green before finally reaching Toledo located on the western shore of Lake Erie and the border of Michigan. I 75 meets the I 475 interchange in the southern suburbs of Toledo in Perrysburg and then I 80, I 90, and the Ohio Turnpike. As the interstate highway passes through downtown Toledo, I 475 meets with I 75 again just north of the downtown area of Toledo. It then continues through some industrial areas as it progresses north before approaching I 280, which is the last major junction in Ohio. I 75 then passes by the Lake Erie neighborhoods of Shoreland and Point Place, just before entering the US state of Michigan with the sign welcoming motorists to Michigan.

Upon entering Michigan, I 75 follows the northwestern shore of Lake Erie, passing through the residential neighborhoods of Toledo and Luna Pier until about Monroe in which it then heads northeast to enter Detroit. The freeway makes an interchange with I 275 in northern Monroe County. On a further note, it does not meet with any major junctions until in Downtown Detroit. Once near downtown, I 75 meets several interchanges: an interchange that leads into Canada via the Ambassador Bridge (international bridge border crossing) to Windsor, Ontario; an interchange with I 375; I 94; I 96; M 10; M 8. I 696 also intersects I 75 in the northern metro area. When the freeway reaches Pontiac, there is a junction with M 59 and in Flint further northward. It meets I 475 and I 69 and overlaps U. S. Route 23 (US 23). The Interstate then heads north toward Saginaw where I 675 acts as a spur route into the city. Further north in Bay City, US 10 provides access to Midland as well as downtown Bay City. When it nears Standish, US 23 diverts from I 75 to Lake Huron, where it heads further north. The last major interchange in the state of Michigan before it crosses the international border into Canada is at 4 Mile Road just south of Grayling where US 127 ends with traffic merging onto northbound I 75 and southbound taking drivers through the center of the state. At Mackinaw City, I 75 makes an interchange with US 31 and US 23 before crossing the Mackinac Bridge to reach the Upper Peninsula of Michigan. I 75 is the only Interstate located in the Upper Peninsula of Michigan and it continues until it crosses the Canadian border via the Sault Ste. Marie International Bridge.

This limited access highway that was planned in the 1950s roughly follows the general route of many older at grade highways, including US 2, US 27, US 25, and US 41, among others. Some of these older US Highways (several of which are still in existence) previously had replaced the eastern route of the old Dixie Highway. I 75 was planned to end in Tampa, Florida, in the original plan for of Interstate Highways. However, beginning in the 1960s, there was a huge growth in the population of Southwest Florida (Sarasota, Fort Myers, Naples, Cape Coral, etc. ), hence the need for new highways, especially a north–south freeway, as well as one connecting Florida's Gulf Coast to South Florida. At first, Florida state legislators proposed a toll in the new highway, and, by 1968, it was decided that the federal government would pay 90 percent toward the extension of I 75 to southwestern and southeastern Florida. This included subsuming a toll highway from Naples to the Fort Lauderdale area, the Alligator Alley, and furthermore to connect this expressway with I 95 in North Miami—though due to some local opposition, I 75 presently ends a few miles short of I 95. I 75 was completed in Kentucky in 1970. The last segment in Michigan opened to traffic on November 1, 1973. The last section of I 75 in Tennessee was completed on December 20, 1974. On December 21, 1977, I 75 was completed from Tampa to Sault Ste. Marie with its final segment opening between northern Marietta, Georgia, and Cartersville, Georgia. It was estimated to have cost $3.5 billion in 1977 dollars (equivalent to $ in ) to build the original section. The final stretch of I 75 in South Florida was completed in 1986 in Miami Dade and Broward counties, and the last stretch to receive the signs for I 75 was the reconstructed (rebuilt and widened) Alligator Alley on November 25, 1992.