thumb|upright|The two kinds of State Road shields used
The State Highway System of the U.S. state of Florida comprises the roads maintained by the Florida Department of Transportation (FDOT) or a toll authority. The components are referred to officially as state roads, abbreviated as SR.
History
thumb|150px|Old [[Florida State Road 18|State Road 18 shield, modified when the road was given to the county]]
Prior to the 1945 renumbering, State Roads were given numbers in the order they were added to the system. The 1945 renumbering removed many roads that were never built and added some that had not existed prior to 1945.
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. Local roads would be completely removed from the system. In 1969, the State Road Department was superseded by Florida Department of Transportation (FDOT).
In 1977, House Bill 803 (HB 803), Chapter 77-165 in the Laws of Florida, was passed in the Florida Legislature. This transportation policy act eliminated the secondary roads, roads that consisted of county roads that were maintained by the state. 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.
Numbering system
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. 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.