London Bus - The red one...

When you press the red button on the handle bar, the alarm inside the driver's cabin says, 'tin!'. It means 'stop the bus - somebody (read I) needs to get down!'. The flash board inside the passengers' cabin says, 'bus stopping', as the driver promptly responds and stops at the nearest bus stop.

Well, thats how it works here in a conductorless 'Red London Bus'