will the D3 using xm navtraffic automatically reroute me according to traffic conditions ahead? or do I need to figure out the route and it just tells me traffic is slow ahead?

This exact question has been posted before, but I will be nice

You need to set a route for the AVIC to notify you of upcoming traffic and ask if you would like to reroute. If not, you will simply see the icons on the screen

thanks.. sorry for being a noob...