The first is the Mainline , a route from the Golden Glades Interchange ( north of Miami ) to Wildwood that carries the hidden designation of State Road 91 ( SR 91 ) , opened in stages between 1957 and 1964 .
The first is the Mainline , a 265 mi route from the Golden Glades Interchange ( north of Miami ) to Wildwood . This has the hidden designation of State Road 91 ( SR 91 ) .