(a) As used in this chapter:

(i) 'Cost of relocation' means the entire amount paid by a utility properly attributable to relocation after deducting therefrom any increase in the value of the new facility and any salvage value derived from the old facility;

(ii) 'Department' means the department of transportation created by W.S. 24-2-101;

(iii) 'Federal-aid highway system' means the federal-aid primary highway system, the federal-aid secondary highway system and the interstate system, including extensions of any of them within urban areas;

(iv) 'Interstate system' means any highway now or hereafter included as a part of the national system of interstate and defense highways provided for in Title 23 of the United States Code;

(v) 'Utility' means all publicly, privately and cooperatively owned utilities, regulated and unregulated, supplying utility services to or for the public.