[Steve in PA]

Right before the New Year I took my son to the Philly airport. We parked the car and I walked into the airport, all the while carrying my off-duty weapon. My son got his ticket, etc and I walked with him until it was time for him to go through the metal detectors and on into the secure parts of the airport.

The police are still going to need PC to search your vehicle. The signs are probably posted as more of a deterent, or to scare people who might think about doing something.