Kach, here is a more detailed wedge.
As far as Pushed or Pulled, again, semantics I suppose. I'm thinking that the air molecules all bunch up as the car passes underneath and forces them to move up. So your question got me to realize instead of "Pressure" maybe we should be talking in terms of "Density", the number of air molecules or Alans that exist in a given volume. When I think of it this way, then the denser air above will want to go into the less dense air being dragged around in the back of the Xd. So is Alan being shoved down by all the guys above, or pulled down by the few that are being sucked down the road? Either way, Alans goin down.