California Codes, Business and Professions Code - BPC, Division 5 — Weights and Measures, Chapter 14 — Fuels and Lubricants, Article 12 — Price Sign Advertising, Section 13534

(a) Except as provided by subdivision (b), and subdivisions (b), (c), and (d) of Section 13532, it is unlawful for any person to place any additional advertising matter on any advertising medium referred to in this article except:

(1) A description of the products offered for sale in letters or numerals not larger than the price numerals.

(2) Methods of sale, such as self-serve or full-serve, in letters not less than one-third the size of the price numerals.

(3) Words describing the type of services offered at the place of business, such as food market, carwash, tune up, and the registered trademark or trade name of the service, but not the price of the service.

(b) Subdivision (a) does not apply to electronic changeable message centers when the advertising content includes both the product offered for sale and its price in a single advertising message, or when the product and price components of the advertising message clearly relate to one another and the price neither starts nor ends the message.