Parking and storage of certain vehicles

a. No unserviceable, discarded or junked automobiles or trailers of any kind or type, or bodies, engines, tires, parts or accessories thereof, shall be parked or stored on any residentially zoned property other than in a completely enclosed building.

b. In any residential district, the parking or storage of commercial vehicles of over 1½-ton weight capacity shall not be permitted except where such parking or storage is directly related to, and in accessory to, a permitted use or legal nonconforming use on the premises.