A 12-mile-long stretch in Broward County, Florida that is now primarily a service road for Interstate 595 (SR 862), with the westbound lanes adjacent to the New River Canal.

[5] In the 1960s, Tamiami Trail was becoming insufficient to handle the rapidly growing traffic between Tampa and South 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 expressway, the "Everglades Parkway" (the original name of the road that became better known as “Alligator Alley”).

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.

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.