(a) A local authority shall not regulate sidewalk vendors except in accordance with Sections 51038 and 51039.
(b) Nothing in this chapter shall be construed to affect the applicability of Part 7 (commencing with Section 113700) of Division 104 of the Health and Safety Code to a sidewalk vendor who sells food.
(c) Nothing in this chapter shall be construed to require a local authority to adopt a new program to regulate sidewalk vendors if the local authority has established an existing program that substantially complies with the requirements in this chapter.