Your smartphone or tablet can now help you steer clear of road hazards that stymie traffic on South Florida roads every day. The makers of the traffic-warning app Trapster estimate thousands of new users around the world are downloading the app every day. "On average, we add between (8,000) and 10,000 new users a day," explained Trapster's product manager, Sean Farrell. "Some of our biggest cities are the major driving cities. Cities like New York, L.A. and Miami."