GPS reroute due to traffic -- never seen this happen yet
If I recall, I've seen this happen on commercials and I've also heard people talk about it somewhere. However, while using the turn-by-turn navigation on my iPhone 5, I've never been rerouted due to the traffic. I've sat in bumper to bumper traffic and it has never given me alternate directions. Do I have to turn this on somewhere? This is very weird.
iPhone 5, iOS 6.0.1