Every person operating a motor vehicle shall, on a signal by a person riding, leading, or driving horses or other draught animals, bring the motor vehicle to a stop, and if traveling in the opposite direction, remain stationary as long as may be reasonable to allow such animals to pass. If traveling in the same direction the driver of the motor vehicle shall use reasonable caution. If such animals appear to be badly frightened, the person operating the motor vehicle, when signalled or requested to do so, shall cause the motor of the vehicle to cease running for so long a time as shall be reasonable to prevent accident, and to insure the safety of those concerned.