Very little evidence of SR55's existence can be found, except in Levy, Dixie, and Taylor counties. In Dixie County, for example, there's a CR55A in Old Town and Fanning Springs. In Chiefland, US19's status as SR55 is exposed in street-name signs, and one shield south of US27 ALT.
SR55 begins at the eastern terminus of unsigned SR684 in Bradenton, Florida, which heads west as US41. The road is the hidden state road for US41, heading north. SR 55 serves as the northern terminus for hidden State Road 683, but not its exposed route US301. From this point, it is the hidden route for a concurrency of US41 and 301. After the intersection with SR64, US 41-301-SR55 concludes its journey through Bradenton and crosses the Hernando Desoto Bridge over the Manatee River and enters Palmetto. The concurrency ends when US301 makes a sharp right turn onto SR43 at a diamond interchange, and SR55 becomes a hidden route only of US41 again. Right after an interchange with the northern terminus of US41 BUS, SR45 shares the hidden concurrency with US41, but almost instantly, SR55 meets another interchange with US19 in Memphis and moves onto that road, only to join I-275(State Road 93) at Exit 5, where they both use the Sunshine Skyway Bridge. At Exit 17, SR55 leaves I-275 and resumes its role as the hidden route along US19 once again, as it will do throughout most of the west coast of the state.
In Pasco County, despite the fact that US19 ALT terminates in Holiday, its hidden route State Road 595 secretly joins US 19-SR55 only to branch off a few blocks later as County Road 595 on Mile Stretch Road. CR595 is encountered again without any markings from New Port Richey to Aripeka, where shields can actually be found approaching Aripeka Road. In Hernando County, the road appears again as County Road 595 which terminates at the gateway to Hernando Beach, Florida. This terminus is across from the intersection of County Road 574, a road that serves as the gateway to Spring Hill, Florida.
After entering Crystal River and passing by the Crystal River Airport, SR55 encounters the eastern terminus of County Road 44W, which secretly joins the road in order to meet the western terminus of State Road 44.
The at-grade interchange with State Road 121 in Lebanon Station also includes County Road 336 and secretly takes the road with it to a local street in Otter Creek.
US27 ALT joins US19-98 in Chiefland, where State Road 500 ends. From here, it becomes the hidden state route of US19, 98, and ALT 27, and instantly intersects US 129, which at one time shared the intersection with US27 ALT. Still in Chiefland, US19-98-Alt. 27-SR55 encounters the eastern terminus of State Road 320, which joins these roads for several blocks before turning east and becoming County Road 320.
In the City of Perry, State Road 30 joins US19-98-Alt 27, and SR55 moves onto US 221. The road narrows down to two lanes at the intersection of US27, although trucks must use a detour. Intersections north of here include CR14 (an extension of SR14) in Shady Grove, an interchange with Interstate 10, and a brief concurrency with US90 in Greenville before finally terminating at the Georgia State Line, where US221 continues onto Georgia State Route 76.
History
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East of the Suwannee River, County Road 55A is a north-south bi-county road entirely within the City of Fanning Springs that connects US19-ALT 27-98 with State Road 26.