yes. that is a novelty "horn". they have "real" horns when the whistle doesn't make the offending person/car/taxi/bike/etc doesn't move.EliA said:Air compression brakes I was familiar with before coming here, BUT what about that awesome whizzing/whistling sound they sometimes make? Is it like a more polite version of the horn? Does anyone know what I'm talking about? It cracks me up every time I hear it.