THE DRIVER'S SIDE AIRBAG DEPLOYED WHILE DRIVING ABOUT FIVE MILES PER HOUR IN DOWNTOWN PHILADELPHIA. NO IMPACT HAPPENED, NO POTHOLE WAS HIT. THE HONDA PLACE WHERE I LEASE THE CAR IS BLAMING IT ON A 4 INCH SQUARE PIECE OF ASPHALT STUCK SOMEWHERE UNDER THE CAR. THAT DID NOT HAPPEN WHEN THE AIRBAG DEPOLYED. MY INSURANCE COMPANY HAS FILED A CLAIM AND WILL EXAMINE THE CAR.