Except as provided in Section 5442.5, no advertising display may be placed or maintained along any highway or segment of any interstate highway or primary highway that before, on, or after the effective date of Section 131(s) of Title 23 of the United States Code is an officially designated scenic highway or scenic byway.
Source:
Section 5440.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=5440.1..