When used in this act:

(a) “A controlled access facility” means a highway, road or street especially designed to expedite and control through and local traffic, and over, from or to which highway, road or street, owners or occupants of abutting property shall have only a controlled right or easement of access, light, air or view. Such highways, roads or streets may be opened to use by all customary forms of street and highway traffic, or they may be parkways from which designated vehicles shall be excluded.

(b) “Highway authorities” means the secretary of transportation and the board of county commissioners of any county or governing body of any incorporated city acting individually or collectively.

(c) “Frontage road” means a highway, road or street which is auxiliary to and located on the side of another highway, road or street for service to abutting property and adjacent areas and for control of access to such other highway, road or street.