2. ½” to 1”
We see in our mirrors somewhere between ½” to 1” of the side of the bus.
More info:
We see in our mirrors somewhere between ½” to 1” of the side of the bus.
This is used as a reference to determine where other objects are in relation to your bus. Devoting too much of the mirror to your bus will greatly reduce the field of view around your bus which the mirror could offer.