The components are referred to officially as state roads, abbreviated as SR.

Prior to the 1945 renumbering, State Roads were given numbers in the order they were added to the system.

[1][2] When the provisions went into effect on July 1, 1977, the division of roads became state, county, and local.

One- and two-digit numbers run in order from 2 in the north to 94 in the south, and A1A (formerly 1) in the east to 99 in the west.

Minor routes assigned three or four-digit numbers are located relative to the east-west control roads on the basis of the first digit.