California Code, Health and Safety Code - HSC § 113831

(a) “Mobile food facility” means any vehicle used in conjunction with a commissary or other permanent food facility upon which food is sold or distributed at retail. “Mobile food facility” does not include a “transporter” used to transport packaged food from a food facility, or other approved source to the consumer.

(b) “Single operating site mobile food facilities” means at least one, but not more than four, unenclosed mobile food facilities, and their auxiliary units, that operate adjacent to each other at a single location.

(c) “Compact mobile food operation” means a mobile food facility that operates from an individual or from a pushcart, stand, display, pedal-driven cart, wagon, showcase, rack, or other nonmotorized conveyance.