Who thought just a few years ago that smartphones would be the way to go for navigation? We used the Garmin, the TomTom and Magellan at one time, and they were all great for getting us around town and areas we didn't know, but now devices like our iPhones and Android phones are taking over those duties.
Smartphones also have the ability for constant app updates and that means that roads and other such information can be updated quickly and easily.
Now Google Maps Navigation for Android is getting an update with real-time traffic re-routing. As Google Mobile's official blog says, "Ever been stuck in traffic, only to to find out you'd have been better off going a bit out of your way to take a less congested route?"
That's the idea. Perhaps you're on the road on the way to work and there is an accident several miles up the road. Anyone who lives in a crowded city knows how crappy that situation can be. Nothing is worse than being stuff in traffic because of the accident (short of being involved in said accident, which is always a terrifying experience). Still, you can reduce more risk for accident by avoiding that congested route. You will also find yourself arriving at your destination much faster and with less frustration.
Real-time traffic re-routing will inform you of these sorts of things and let you know which way is best to go so you don't find yourself in a jam. This previously wasn't the case as the application would simply find the "fastest route" which usually just means the shortest distance, but that usually doesn't take traffic conditions into account.
[Via Google Mobile Blog]