As used in this chapter:
This chapter shall only apply to any works or facilities of any public agency or public utility if such works or facilities are installed pursuant to franchise in, under or over any public highway. This chapter shall not limit the powers and duties vested by law in the Public Utilities Commission of this state, and in the event of any conflict with regard to the powers and duties given the road commissioner in this chapter, those of the Public Utilities Commission shall prevail.
Ca. Sts. and High. Code § 1450