Google just bought WAZE for a cool billion+.
WAZE has perhaps the largest social network in the world, with something like 30% of users also submitting reports of traffic, accident, or speed trap location.
It also, IMHO, has a better navigation system because it "learns" based on user input. As an example, after 2 reports of a red light camera it will try to navigate folks around the camera rather than through it. A road that has recently been put in? Report it and get taken to their mapping app so you can enter it into the database. A few more reports will refine it as nicely as if the national geodedic survey has done the mapping. And best of all, driving directions to London do include where to get on and off the ferry rather than being routed through the future site of the trans-Atlantic underwater bridge.
stay safe.