Without mentioning the drivers: The roads are all fairly smooth and wide on major routes in South Florida. The only exception is I-95; it's 7 lanes in some places, and 3 lanes in others. There's not much lane-count consistency, which create a bottleneck every couple of miles during rush hours.
Since we have no ice or snow, we have no potholes; maybe in a few places such as secondary roads and city-maintained roads that are in really bad shape. There are few ditches, and just about every route that has a canal alongside of it has guardrail or concrete barriers. Just about every state/county-maintained road in South Florida has been re-paved in the past 10-15 years, and that's because nearly every road was under construction for widening in the late-1980s.
There's lots of well-marked signs (well, it was pretty good until the Wilma knocked down half of them), no nameless roads (although some major roads change names often). The set-up down here is like a big grid, since most roads were created 50-100 years ago, and there's almost no terrain for the routes to dodge, other than large or historic buildings.
All of this sounds like driving paradise...Sure, except 95% roads are straight and boring, with no elevation changes. You knew there had to be a catch, right? There are almost no country, backwoods roads. Even the few that inspire spirited driving are usually well-patrolled by radar.
If you want to have driving that resembles fun, you have to leave the Miami-Ft.Lauderdale-West Palm Beach metro area entirely. That's 2 hours away from where I live. In short, amny of those roads are also in good shape, although many principal routes could use more lanes. There's a lot more curves as the land has more lakes and hills (the center of the state has so many lakes, that you could spend weeks just driving on all the roads for fun).
Many of the "fun" roads have been altered over the years for better safety; for example SR 29 lined a crooked canal, which was rather fun and scenic as canopies of cypress trees shrouded the route. Sure, the Armco was just a foot or so away from your right-side wheels, and just a foot or so away from the canal...but when the state wanted to re-pave and make the road a little wider, they decided to move the guardrail 5 feet from the canal, the road 10 feet from the guardrail, and since all those nice trees were in the way, let's just chop all those down too...and then they "straightened" the road out at the expense of naturally-planted trees in the Everglades and driving fun and character of the location.
So there's my road report for Southern to Central Florida.