16-1-109, or vehicles owned by an irrigation district created

16-1-109, or vehicles owned by an irrigation district created under W.S. 41-7-201 through 41-7-210 or vehicles owned by a weed and pest control district created under W.S. 11-5-101 et seq. provided the vehicles are essential to the operation and maintenance of the district and are used for no business or commercial activity unrelated to the operation and maintenance of the district, or vehicles owned by a senior citizen center that is providing services to senior citizens under W.S.