Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Interstate Highways of the Florida State Highway System
The Interstate Highways in the state of Florida are owned and maintained by the Florida Department of Transportation (FDOT). There are four primary interstate highways and eight auxiliary highways, with a ninth proposed, totaling 1,497.58 miles (2,410.12 km) interstate miles in Florida. The longest interstate is I-75, extending 470.678 miles (757.483 km), and the shortest is I-395, extending just 1.292 miles (2.079 km).