State Road 5 is the "hidden" (unsigned) FDOT designation for not only the Overseas Highway, but virtually all of US 1 south of Jacksonville since 1945. Along with Card Sound Road, the Overseas Highway is one of only two roads that enter and exit Monroe County and the Florida Keys. From 1938 to 1945, US 1 carried the designation State Road 4A.
Former State Roads in the Florida Keys
State Road 5A (now Monroe County Road 5A): Flagler Street from First Street to South Roosevelt Boulevard (SR A1A) in Key West. ... Read More