As used in this act:

    (a) "Parking area" means an area used by the public as a means of access to and egress from, and for the free parking of motor vehicles by patrons of a shopping center, business, factory, hospital, institution, or similar building or location.

    (b) "Shopping center" means a minimum area of 3 acres of land on which there is located 1 or more stores or business establishments, and where there is provided a parking area.