The concept is pretty simple. Users drive around with the app open on their phone and the program samples GPS data to determine whether traffic is moving at speed or at a standstill. From there, you can report accidents, speed traps or road work to keep those around you from winding up in the same mess. Meanwhile, you can check the status of traffic on alternate roads around you thanks to the same technology.
Waze is also on the verge of rolling out a handful of new features that should improve the experience, including Twitter and Facebook integration. Instead of just sampling other Waze users, the program will cull through tweets from all over the globe. If someone happens to take the time to shoot off a tweet that says traffic on Mullholland sucks, you'll get a notification if you're headed in that direction. We've yet to get a chance to play with the app in traffic, but it sounds handy. For more info, check out the Waze guided tour.