Length: 339 mi. Direction: north-south. Florida State Road A1A (SR-A1A) runs along the Atlantic Ocean, beginning in Callahan, and ending in Key West. The highway passes through the counties of Monroe, Miami-Dade, Broward, Palm Beach, Martin, St. Lucie, Indian River, Brevard, Volusia, Flagler, St. Johns, Duval, and Nassau. Part of SR A1A is designated as "A1A Scenic and Historic Coastal Byway". It was opened in 1945.
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