Have to agree with you BRUpax,
e.g. LAX
No automobile except taxis or buses allowed to deliver passengers to terminals. What exactly this is supposed to prevent is unclear. To close the car parks yes... I can pretty much understand that, but to stop people being dropped off????
The bomb hidden in a suitcase is no more likely to be found because it is arrives with a passenger in a taxi than if it were to arrive with a passenger in a normal car!!!
Come on LAX!!! Why not just enforce a STRICT "no loitering" policy when dropping off passengers like they are doing in Atlanta.