Section 13.20 - Obstruction of airstrips(a) A person may not place an object on the surface of an airstrip that, because of its nature or location, might cause injury or damage to an aircraft or person riding in the aircraft.(b) A person may not dig a hole or make any kind of excavation, or drive a sled, tractor, truck, or any kind of vehicle upon an airstrip that might make ruts, or tracks, or add to an accumulation of tracks so as to endanger aircraft using the airstrip or persons riding in the aircraft.