MIAMI BEACH, Fla. (AP) — South Florida is seeing a wave of new cars, but they won’t add to traffic or lengthen anyone’s commute. That’s because the cars are made of marine-grade concrete and were installed underwater. Over several days late last month, crews lowered 22 life-sized cars into the ocean, several hundred feet off South Beach. The project was organized by a group that pioneers underwater sculpture parks as a way to create human-made coral reefs. “Concrete Coral,” commissioned by the