California Code, Streets and Highways Code - SHC § 229.28

The number of generic tourist oriented directional signs shall not exceed three signs on an approach to an intersection from either direction.  If more signs are requested than authorized by this section, the department shall select the three facilities or attractions receiving the highest rankings based on existing criteria and point ranking systems developed for other business signing programs.  Based on the rankings, an existing sign posted pursuant to this chapter may be displaced by a new sign at the end of a two-year contract.