Cal. Streets and Highways Code § 101.4 (2026)

The department shall replace or cause to be replaced any city limit road sign if all the following conditions exist:

(a)If the legislative body of a city requests the replacement.

(b)If the request is based upon a substantial change of population evidenced by a special or general federal census.

(c)If no previous request has been made by the city within a period of five years.