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Interstate 75 (abbreviated '''I-75''') is an Interstate Highway in the midwest and southeastern United States . It travels from Florida State Road 826 (Palmetto Expressway) and Florida State Road 924 (Gratigny Parkway) in Hialeah , Florida (just west of Miami ) to Sault Ste. Marie, Michigan at the Ontario , Canada border. HISTORY This limited access highway planned in the 1950s roughly follows the general route of many older at grade highways, including U.S. Route 2 , U.S. Route 27 , U.S. Route 25 , U.S. Route 41 among others. Some of these older U.S. Routes (several of which are still in existence) in turn replaced the eastern route of the old Dixie Highway . The final stretch of Interstate 75 was completed in 1986 in Dade (present Miami-Dade) and Broward Counties in Florida , although the last stretch to receive the I-75 signage was a revamped Alligator Alley in 1993. LENGTH MAJOR CITIES AND STRUCTURES Bolded cities are officially-designated Control Cities and other structures for signs.
INTERSECTIONS WITH OTHER INTERSTATES
SPUR ROUTES
LANE CONFIGURATIONS Michigan
Ohio
Kentucky
Tennessee
Georgia :Total lane mileage in Georgia is 2,144.71 miles (3,451.58 km)
Florida
NOTES Florida The Alligator Alley section west of Fort Lauderdale, Florida is due east/west and is one of only two sections of I-75 that are tolled (the other is the Mackinac Bridge ). The eastern terminus of Alligator Alley, the southern terminus of Sawgrass Expressway , and the western terminus of Interstate 595 are in the same Stack Interchange . Originally, I-75 went through Tampa and St. Petersburg , while the current I-75 was to be called I-75E. Because of Interstate restrictions dealing with suffixes to routes, I-75 was rerouted along I-75E, and the original I-75 was renamed I-275 . Like any other Florida interstate, there is an unsigned state road designation associated with Interstate 75. For most of its length in Florida, Interstate 75 is unsigned Florida State Road 93 . The lone exception is in the Tampa - St. Petersburg area, where it is unsigned Florida State Road 93A. This is because SR 93 was designated along the original I-75 routing. When the Interstates were renumbered, the state route designations were not changed to match. I-175 and I-375 are very brief Interstates that go east into downtown St. Petersburg, while I-275 goes into downtown Tampa, across the Howard Frankland Bridge into St. Petersburg, then south across the Sunshine Skyway Bridge , reconnecting with I-75 in Manatee County, Florida . Georgia In the center of Atlanta, Georgia , I-75 merges with I-85 for a short time. This strip of highway, called the Downtown Connector , is infamous for its bad traffic. There were plans for a spur from Cordele into Albany, Georgia , called I-175; the roadway was constructed but was not given limited access. It was signed as SR 300 and called the "Georgia-Florida Parkway" instead. All U.S. Interstate Freeways, as indeed all other limited access freeways in Georgia are multiplexed with State Routes (typically being of the 4xx construct, with very few exceptions). I-75 in Georgia is multiplexed with Georgia State Road 401. Ohio / Northern Kentucky In the Cincinnati, Ohio Northern Kentucky area, I-75 runs together with I-71 , from approximately 20 miles south of Cincinnati, over the Brent Spence Bridge across the Ohio River , splitting from I-71 immediately after entering Cincinnati, Ohio. In the Cincinnati area, I-75 is also known as the Millcreek Expressway. Michigan In Detroit , the spur route I-375 is the shortest signed Interstate highway in the United States (i.e. it has an actual sign with the road number on its stretch) at 1.06 miles (1.71 km). There are shorter Interstate highways, but none are signed. I-75 connects Michigan's Upper and Lower Peninsulas via the 5 mile long suspension Mackinac Bridge . At the northern end of I-75, at Sault Ste. Marie, Michigan , the Sault Ste. Marie International Bridge leads into Canada , into Sault Ste. Marie, Ontario . This is the closest connection of any Interstate to the Trans-Canada Highway . However, there is no direct freeway connection; bridge traffic funnels onto city streets. The section between Grayling, Michigan and Michigan State Highway 32 was built in 1961 . This section was built by converting the northbound lanes of U.S. Route 27 to southbound lanes and building a new set of northbound lanes leaving the former southbound lanes as a strip of grass, most likely because of plans to upgrade that stretch to Interstate Highway Standards . The terminus of the freeway near downtown Grayling was converted to a partial interchange for what would become BL I-75 between that and M-93/Hartwick Pines Road . Alongside that, the former segment of US-27 between Grayling and Gaylord, Michigan was turned back to local control. After this individual segment of freeway was completed, it left a gap between Gaylord and Indian River which was filled in a year later. While the gap was being filled in, a special "TO I-75" designation was applied to the former segment of US-27. Around that time, US-27's northern terminus was scaled back to 5 miles south of Grayling until it was redesignated as an extension of US-127 in 2001 . Until the early 1970s , I-75 between Bay City and Grayling was routed west to Clare (along US-10 then north along then- US-27 , and was signed as "TEMP I-75". This freeway segment had some at-grade intersections at the time. In 2002 the portion between Clare and Grayling was redesignated as an extension of US-127 , although it was posted as US-127 on a National Geographic road atlas in the year 2000 . In the 1960s , I-75 had several discontiguous segments connected with roads with "TO I-75" signs in addition to US-10 doubling as "TEMP I-75". The routing between Alger and Roscommon was completed in 1973, and the temporary section reverted to U.S. routes, although of freeway quality. Until the completion of I-75 in 1973 , the stretch of expressway between Standish and West Branch had the designation of Michigan State Highway 76 . When the I-75 signs were erected along the expressway, M-76 vanished from the state road map after 53 years of existence. Until 1987, US-10 and I-75 were the same road between Bay City and Clarkston . Both were also complexed with US-23 between Bay City and Flint. Now, Bay City serves as the eastern terminus of US-10. As late as 1990, US-31 and US-23 both had their northern termini on I-75's southern approach to the Mackinac Bridge. Even though US-27 was scaled back 94 miles (from Mackinaw City to south of Grayling) in 1961 , a lone sign assembly showed all three US highways ending at the same place as late as 1971 . FORMER FREEWAY DESIGNATION SEGMENTS
Florida
Georgia Tennessee Kentucky Ohio Michigan
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