Regarding the comment about lots of blue lights frightening the passengers, when I was at sunny Gatwick many years ago there were a series of discussions about the need for the local authority fire brigade to charge up the A23 out of Crawley every time there was a full emergency. There had never been a case at Gatwick where a declared full emergency had turned into an accident and the airport fire service were always on hand.. .The discussion had arisen because of rising fuel costs and local authority budget problems. Frightening the passengers was mentioned as another excuse.. .Luckily, in my opinion, no-one was prepared to be the one to make the decision to change the orders and therefore call Mr Murphy to invoke his Law so, as far as I know, everyone still turns out.