One woman actually ran after me while we were still at the market, trembling like a leaf on the phone with someone who said that three people we'd spoken to had already been arrested.
Travel times have fallen, the country's economy has boomed, cities have exploded - and the rest of the world has been left wondering how they'll ever come close to building at such an insatiable pace.
We're here in beautiful Miami ahead of the big Formula One race this weekend, where drivers like the legend Lewis Hamilton will be going, flying down the track more on him in a few.