All right, I asked this in the Hellblazer thread since it was higher at the time, and everyone just plowed right over it. So I'll ask you guys, since it's from the new Swamp Thing comic:
Why can't Constantine drive?
Draven: It's not possible to have 2 people in tune with the Red? Aquaman taps into the Blue now, and Swamp Thing has acquired mastery over the Blue, so there's 2 Blue avatars as well.