its current designation after people were confusing the original “SR 1” with nearby U.S. Route 1 (and US 1A/Alternate US 1 was also near the State Road), the SR A19A designation was the original numbering of the Pinellas Bayway. Since A19A branches off Alternate US 19 and connects with the parent route US 19, a likely explanation for the numbering is for the loop to represent “Alternate (U.S. Highway) 19 Alternate,” or “Alternate (U.S. Highway) 19A.” History For two decades after the opening of the Pinellas Bayway on December 23, 1962, “A19A” signs lined the entire route (the east–west Pinellas Bayway originally had only SR A19A signs, while the other two parts had the A19A signs alongside – or instead of – the other State Road designation). In the mid-1980s the Florida Department of Transportation removed the A19A designation, and gave the Pinellas Bayway its current designation, while restoring the designations of SR 699 and SR 693 along their routes. References A19A