Cal. Sts. & High. Code § 711

Nothing in this article is intended to prevent the department from making reasonable rules and regulations and requiring reasonable conditions in permits concerning the place, manner and method of location of utility facilities in, under, over or along freeways. Specifically, without limiting the generality of the foregoing, the department may make regulations or require conditions to the end that the cutting of pavement on freeways and a consequential impairment of the use thereof by the traveling public, shall be avoided insofar as possible.