Trotro conductor dangles on a bus

A Mercedes trotro bus on the Odorkor highway

This trotro bus plies a fast highway. The arm thats sticking out of the door is that of the conductor. He has to keep signaling the destination of the vehicle to bystanders. Its important he gestures because if the prospects indicate in advance that they are not going his direction, then they drive on. Stopping can be negative for a driver because other buses can overtake him and mop up more passengers ahead of him.