Unfortunately most ideas are not cost effective, and currently any new inventions will incur costs, I have both an inexpensive reality plan as well as a futuristic expensive plan. The least costly way to go would to first divide all highway lanes into categories. The snowbirds and elderly, vacationers , could be bundled into two right lanes, half the congestion is when someone is driving 40 miles on a highway and people trying to get to work at high soeeds. We could utilize two lanes primarily for that category of the elderly and vacationers , and utilize the other two left lanes for Floridians and business vehicles. That would help cut congestion because drivers could use one left lane for getting back and forth to work in a slower left lane and the furthest left lane can remain the same at higher speeds for employees and Floridians it wouldn't cost anything but categorizing with signs describing what lane is for what groups one sign for the two lanes for elderly and vacationers and a sign describing the two left lanes for Floridians and business traffic, We could do that in Broward and Dade where the highways have four lanes. The next least expensive is to build an elongated two lane highway above the highway with these divided categories of elderly and vacationdr traffic except that one of the groups would be on the ground on lanes and the other group driving above on a elongated type bridge above the highway, the next would be extremely expensive it would a on the side of the highway people mover like the one in downtown Detroit except more expansive, this people mover sould have terminal stations where self driving vehicles, hover cars, autonomous drone cars, or uber And Lyft cab pickup to manuver into the actual city not on highway from the people mover stations, another idea is to use a straight fast moving hover type ride that stops at stations.