ESSENTIAL SERVICES AND UTILITIES. The erection, construction, alteration, or maintenance, by public utilities or municipal or other governmental agencies, of gas, electrical, steam, or water transmission or distribution systems, collection, communication, supply, or disposal systems, including poles, wires, mains, drains, sewers, pipes, conduits, cables, fire alarm boxes, police call boxes, traffic signals, hydrants, and other similar equipment and accessories in connection therewith; reasonably necessary for the furnishing of adequate service by such public utilities or municipal or other governmental agencies for the public health, safety, or general welfare.