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The Commercial Driver's Handbook suggests several things to do when you pass a vehicle. Which of these is NOT one of them?

A Constantly blow your horn while passing the vehicle.

Allow for the possibility that the driver of the vehicle that you wish to pass doesn't know you're there. Make your presence known to the driver. In the daytime, tap your horn very lightly; at night, briefly flash your headlights. However, sound a sharp blast on your horn only as a warning to others of danger.