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If you are on a bus and another bus is passing in the opposite direction, you may notice that the driver of the other bus waves to the driver of the bus you are on. Or if it is at night they may flash their headlights at each other.

This is known as the 'bus driver 's salute.
Bus driver: He's my buddy from the depot. He's on the same route as me so we always give each other the Bus Driver's Salute when we pass each other on the road.
by Goth Doll July 15, 2016
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