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Interstate 4 (abbreviated I-4) is a 132.30-mile (212.91 km) intrastate Interstate Highway located entirely within the state of Florida, United States. It goes from Interstate 275 in Tampa, Florida to Interstate 95 at Daytona Beach, Florida. It also has the Florida Department of Transportation designation of State Road 400, but only a small portion of the route is signed at the east end.
I-4 is currently the lowest-numbered Interstate Highway in the contiguous 48 U.S. states.
The combination of the Tampa, Lakeland, Orlando and Daytona Beach metropolitan areas is often referred to as the I-4 Corridor, since the freeway connects all four.