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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).
In 1955, the State Road Department (SRD) slowed the addition of new state roads and began to classify roads into primary, secondary, and local roads. Primary roads would continue to be state-maintained, while secondary roads would have an S before the number, and would only be state-maintained during a construction project.
The first digits of state highways with some exceptions (such as State Road 112 (SR 112) connecting Interstate 95 (I-95) to the Miami International Airport) are numbered with the first digit indicating what area of the state the road is in, from 1 in the north and east to 9 in the south and west. Major north-south state roads generally have one ...
The U.S. Highways in Florida are the segments of the United States Numbered Highway System maintained by the Florida Department of Transportation (FDOT). Prior to 1993, Florida used colored shields for its U.S. Highways. There are 18 current U.S. Highways in Florida and 2 former U.S. Highways.
U.S. Route 90 (US 90) in the state of Florida is the northernmost east–west United States Numbered Highway in the state. US 90 not only passes through the county seats of all the 16 counties it runs through on its course in Florida and is also the road upon which many of the county courthouses are located, but it was the first paved road in Florida (from Jacksonville westward a few miles).
Interstate 4 (I-4) is an Interstate Highway located entirely within the US state of Florida, maintained by the Florida Department of Transportation (FDOT). Spanning 132.30 miles (212.92 km) along a generally southwest–northeast axis, I-4 is entirely concurrent with State Road 400 (SR 400).
U.S. Highway 1 (US 1) in Florida runs 545 miles (877 km) along the state's east coast from Key West to its crossing of the St. Marys River into Georgia north of Boulogne and south of Folkston. US 1 was designated through Florida when the U.S. Numbered Highway System was established in 1926.
State Road A1A (SR A1A) is a major north–south Florida State Road consisting of seven separate sections running a total of 338.752 miles (545.168 km) along the Atlantic Ocean, from Key West at the southern tip of Florida, to Fernandina Beach, just south of Georgia on Amelia Island. It is the main road through most oceanfront towns.