I checked on my way out of Pudong on Jan 10.

The outer lanes were restricted to cars with more people than just the driver. T2 actually had a policeman watching and checking. T1 did not, but that does not preclude some type of camera --- although it would be very hard to prove there is not a second person in a car from a photo. Easier to prove the presence of a second person than disprove. That rarely stops Chinese police from issuing tickets, though.

Seems that the arrivals level is now open to private cars to pick people up -- therefore the restriction on picking up on the departure level. I was in a parking shuttle bus, whose driver told me this. Also, other Chinese passengers who parked at the same place as me were just as surprised as me at this development.