The real trick comes when two buses on different routes approach a stop and the second one is intent on overtaking the first...

 
Dilton Marsh made me think. There should probably be an entirely different thread on the subject of how to hail a bus, as this is often  another training issue (for the passenger) though bus companies could also help by ensuring that buses listed as stopping at a particular stop actually do call there - or having sufficient capacity that intending passengers don't experience full and standing services sailing past stops.

Often, for the driver, intending passengers seem to think that they're bidding in an auction - perhaps a slight touch of the nose - a small twitch of some possession in their hands - a head movement and blink.

The opposite being the over-gesticulation - a dash to the kerb edge, wild hand raising, both arms forward with shopping in both hands.

The former means that the driver needs to be clairvoyant. The latter means that that it's difficult for them to make the most of the interface between bus and kerb.

This could be addressed via dance and drama in schools if there is still such a thing as there's a tie-in with the basic art of expressing yourself appropriately using movement. It's non-verbal communication at a distance. In this case with the driver of a bus (or train) and it's a skill that's on a scale from being useful to being a lifesaver.

Mark