Waze is a pretty darn nifty little app that gathers your traffic information as your drive along, you can quickly add notices to Waze, if you see an accident, or cops, and your speed will tell Waze a lot about the traffic situation, which it then shares with other Waze users. Honestly, love the app.
What does it lack? Languages! Personality! So that's why they called Brasilian Blur Leandro Barbosa to have him speak the Waze traffic commands & updates.