move this to the android app forum
i know here in la many local news stations recommend Waze Social GPS Maps & Traffic
i never used it before, but i hear great things about it.
Waze its my choice too. Although, as a warning, the way Waze world is if people turn it on while driving, regardless if you need directions or not (from what I can tell - I could be wrong)
So, Waze will collect data from you, some automatic data, such as driving speed and gps location, and direction. And some manual, such as traffic reports, car accidents, police presence, and even traffic cameras.
Waze will then compile the data and"share" with all the online users.
One of the big helps Waze gave me was it allows messaging. For example, there was extremely slow traffic for about 10 miles. Because if slow traffic I was able to view the Waze messages and get informed not only was there a car accident, but a truck had flipped. 30 min later, the messages updated that the truck was cleared and it would only be tune until traffic slowly cleared again.
Of course I don't suggest it is ok to drive and enter info to the app, but Waze is a useful app.