(1) You must make sure truck drivers operate equipment at a safe speed at all times for roadway conditions.

(2) You must make sure truck drivers either:

(a) Sound their horn before starting to back and intermittently during the entire backing operation; or

(b) Have a working automatic reverse signal alarm that is audible:

(i) Above the surrounding noise level; and

(ii) No less than fifteen feet from the rear of the vehicle.

(3) You must make sure, during the backing of trucks where vision is obstructed, a signal person is stationed at a point giving a clear view of the rear of the truck and the operator of the truck at all times.