Here in Southern California, Toll roads are a nicety - not required (like the highways of Kansas). So I don't take them. Turn-by-turn always gives me instructions to take the toll road when I travel down towards Orange country and LA areas. How do I tell it to not take me on the toll roads? I know most mapping software allows you to configure this. Is it possible with turn-by-turn or do I need to tell the OnStar person to configure it when they get my route?