There's some major construction on the Cross Bronx right after the GWB. I would check the traffic reports before committing to the GWB.
When is there ever NOT major construction on the Cross Bronx

?
I'm back! Yes, there was traffic and slow-downs. As I expected.
Know what I hate most? Amateur drivers. When it's the regular rush-hour traffic, the ones that do it every day, it's okay. The ones that don't, it's a nightmare of folks who don't know how to merge, who get upset that nothing is moving, who miss their exits and who are staring at their blackberries to see if there's some way to get around the mess.
At least it wasn't New Years' Eve, which I consider the worst time ever to drive in the NYC metropolitan area.
Happy Driving to whoever is nuts enough to do it

.