(a) When an operator of a motor vehicle is approaching a person riding a horse on a public highway, such operator shall reduce speed appropriately or stop, if necessary, to avoid endangering the equestrian or frightening or striking the horse.

(b) No operator of a motor vehicle in the vicinity of an equestrian and horse may blow a horn or cause loud or unusual noises, in a manner to startle or frighten the horse.

(c) A statement concerning such responsibilities shall be included in the instruction manual for motor vehicle operation of the Department of Motor Vehicles.