Going "underground" in Florida is typically prohibitively expensive, but it's possible if you're willing to fudge things a bit. Disney's Utilidoor System is a tunnel system that sits above the water table by itself being mostly at ground level, and then having the parks built a story above it. The Lagoon around Disney comes from the dirt dug up to create the effect.
I believe the concept for a underground transportation/roadway layer in the original Epcot city worked on the same idea but massively expanded, somewhat similar to a modernized/expanded Chicago Tunnel Company lines.
A photo of the Epcot "Transportation Layer" concept art can be seen here.
That's cool, I didn't know about the Epcot concept city. It reminds me of Louvain-la-Neuve in Belgium, a "new town" built by and for a university in the early 1970's:
"the city center is built on a gigantic concrete slab, with all motorized traffic travelling underground. This allows most of the ground level of the city center to be car free. Most buildings are built on the slab (la dalle), and the pedestrian area is expanding even far from the city centre."
(I also learned about Louvain on HN last year, but I can't find the link now)
Though when you think about these layered cities really require a lot more cement, just so you can have your car in a basement. It was so much more efficient to have a dense city and a train station to go most places.
If only you knew how much I wish even some of the original Epcot city had been built in Central Florida. My life would be so much different it would be unrecognizable.
I believe the concept for a underground transportation/roadway layer in the original Epcot city worked on the same idea but massively expanded, somewhat similar to a modernized/expanded Chicago Tunnel Company lines.
A photo of the Epcot "Transportation Layer" concept art can be seen here.
https://www.yesterland.com/domedcity.html