Special routes of U.S. Route 19
Wikimedia list article

Several special routes of U.S. Route 19 (US 19) exist. In order from south to north, they are as follows.
Brooksville alternate route
U.S. Highway 19 Alternate (US 19 Alt.) was a former segment of US 19 that ran from Bayonet Point to Brooksville, Florida, which only existed for one year. It ran along what is today State Road 52 (SR 52) from Bayonet Point to Gowers Corner, and then turned north along US 41 into Brooksville.
St. Petersburg–Holiday alternate route
U.S. Highway 19 Alternate (US 19 Alt.) is the 40.08-mile (64.50 km) former section of US 19 from St. Petersburg to Holiday, Florida.
Beginning at the intersection of 4th Street North (US 92 and SR 687) and 5th Avenue North in St. Petersburg, it runs west of US 19 near the Gulf coast passing through the cities of Seminole, Clearwater, Dunedin, and Tarpon Springs before ending at US 19 in Holiday, Pasco County. It is also the unsigned State Road 595 (SR 595) throughout the entire route, and runs along much of the Pinellas Trail.
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