Waze for Android

Waze is an application for road navigation with a social bias. Just by traveling with Waze enabled, you help to update information about roads and traffic jams. You can send reports about accidents, hazards, police and other events, as well as receive this information from others, including prices at gas stations. In addition, Waze helps you stay in touch with your friends when you are on the go.

The current route is calculated taking into account current traffic jams and general information about roads
Notifications from the community, including about accidents, hazards, traffic police crews, closed roads, and others
Step-by-step voice prompts for navigation
Fresh maps, constantly edited and updated by the map editors of the Waze community
Automatic route change depending on the current traffic situation
Remembers your usual destinations, travel times, and preferred routes
Finds the cheapest gas station on the route
Adds friends directly from the phone book
Monitors the RVP of friends traveling to the same destination
Sends automatic updates of your location and RVP 
In addition to the community of drivers sharing information through the app, Waze is also an active community of online map editors who try to keep maps in their area as up-to-date as possible.