I know someone who commutes from NJ back to the city via the GW, and she doesn't sit in traffic. Obviously, there's no clear rule as to what is the best traffic-free route/time, but she's on the bridge around 5:45pm daily and hasn't had any issues. She says once in a while route 80 is a disaster, but there is usually never traffic. I figured I can work around traffic- if that means leaving an hour or 2 after class ends to avoid traffic times, I could just study in the library. I know Newark traffic is terrible as well, so even if I was living in Jersey, I would probably leave later to avoid sitting in a parking lot.
I know the tolls are expensive, hence the reason for posting! If I can find someone to carpool with, it cuts the cost in half.