Florida State Road 84

In the 1960s it was becoming apparent that the Tamiami Trail was becoming insufficient to handle the rapidly growing traffic between Tampa and southeastern Florida, and adding lanes to the road that was once considered a major engineering feat was not feasible in light of the demands of nearby Everglades National Park and the Miccosukee Tribe living near the Trail. It was finally decided that a second transpeninsular road would be best to serve the need of motorists to go from “coast to coast” south of Lake Okeechobee, the new one featuring a toll limited access two-lane freeway, the "Everglades Parkway" (the original name of the road that became better known as “Alligator Alley”). On January 15, 1969, the highway was completed, and the State Road 84 designation and signs were placed along the entire length of the road (101 miles or 162.54 kilometres) from Naples to Fort Lauderdale.

Two decades later, the southern extension of Interstate 75 from Tampa was moving forward with earnest, as was the construction of Interstate 595. Because the population and traffic of southern Broward County were growing at a fast rate, Interstate 595 was being built to improve the connections between the Alley and US 1 (and improve access to Port Everglades and Fort Lauderdale-Hollywood International Airport), and the eastbound lanes of SR 84 were shifted southward to accommodate the new expressway that runs down what once was a large grassy median with limited cross-overs/turnarounds for SR 84. I-595 was opened to traffic in the mid-1980s.

When four-laning of Alligator Alley was completed to Interstate highway and environmental standards (several tunnels were constructed at various points under the road for the critically endangered Florida Panther), signs along the toll road identifying it as SR 84 were removed, and I-75 signs went up to replace them in early 1993. While the SR 84 could have remained the hidden designation of the road, the Florida Department of Transportation decided to supersede it with the hidden designation already in place for I-75 south of Gillette: SR 93. This created the disconnection of SR 84 that exists to the present day.

• Florida Route Log (SR 84)