| State Highway System | |
|---|---|
Standard route markers in Florida | |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Highway X (US X) |
| State | State Road X (SR X) |
| System links | |

TheState Highway System of the U.S. state ofFlorida comprises the roads maintained by theFlorida Department of Transportation (FDOT) or atoll authority. The components are referred to officially asstate roads, abbreviated as SR.

Prior to the 1945 renumbering, State Roads were given numbers in the order they were added to the system. The1945 renumbering removed many roads that were never built and added some that had not existedprior to 1945.
In 1955, theState 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. Local roads would be completely removed from the system. In 1969, the State Road Department was superseded byFlorida Department of Transportation (FDOT).
In 1977, House Bill 803 (HB 803), Chapter 77-165 in theLaws of Florida, was passed in theFlorida Legislature. This transportation policy act eliminated the secondary roads, roads that consisted of county roads that were maintained by the state.[1][2] When the provisions went into effect on July 1, 1977, the division of roads became state, county, and local. Most secondary roads and some primary roads were given to the counties, and occasionally a new state road was taken over; some main roads in incorporated areas were given to the localities.
State road numbers are assigned by FDOT. Every state road must have a number. The road segments can be discontinuous (or interrupted) but the separate segments must have a logical and sequential connection between them.[3] A road cannot ever split into two different roads with the same state road or county road number unless it is to allow for a one-way pair to connect to a two-way road. There is also no minimum required length for a state road.[3]

Odd-numbered roads run north-south and even-numbered roads run east-west. One- and two-digit numbers run in order from2 in the north to94 in the south, andA1A (formerly 1) in the east to99 in the west. The major cross-state roads end in 0 and 5. Three-digit numbers increase from east to west across the band.30 is skipped because it runs along theGulf Coast in thepanhandle and doesn't go all the way across the state.[3] (The graphic above shows SR 30 change to SR 20 going east of the panhandle.)
Minor routes assigned three or four-digit numbers are located relative to the east-west control roads on the basis of the first digit. For example,State Road 464 is located betweenState Road 40 andState Road 50.[3]
Every section ofU.S. Highway andInterstate Highway has a State Road number assigned to it, usually unsigned (for example,Interstate 4 is also unsignedSR 400). In addition to some named toll roads (for example,91 and821, which make upFlorida's Turnpike) some minor State Roads are also unsigned (likeSR 913 andSR 5054).