In addition to the Boca del Rio bridge being closed to vehicular traffic (but not bikes or pedestrians) for another day for construction, we ran into this traffic stop just south of the airport while riding around doing our daily grocery shopping,  They don't seem to make bikes stop, fortunately, so we just went around.
This guy had another good idea:  just avoid the roads completely!  He was riding in a unique stand-up canoe, powered by a pole (the water is very shallow) and a small sail.