I havent been here in a while as it is an emergency service however I remember when I was in high school going down for a careers day and being allowed to sit in the front of the fire engine. Whether I'm with my friends or family, the firemen always wave either first or back. I'm 21 now and this is a game I've been playing since I was maybe 8. I don't know why or how it started and arguably I should stop as its childish . But it always makes my day and it makes it much more better when a group of them wave back with smiles on their faces. The staff have changed over the years however there's still that friendly smile and wave when they are out and about.