I have a TRAF button, but all that it does is kick me over to the closest radio station that broadcasts traffic news. Not very reliable, as they are not broadcasting traffic all the time!!
I even checked out all the AM stations, and none of them were giving traffic at that time either.
So dunno, maybe I'm not getting something. But that's why I prefer to stay on roads like this one. Very little traffic here. View is much better too!