Sts. & Hy. Code, § 30108

Every contract which the commission enters into with, and every permit which it grants to, any person, or private, public, or municipal corporation, any district or political subdivision, for the transportation of persons or property by such person, or private, public, or municipal corporation, or district or political subdivision over any toll bridge or other toll highway crossing, or over the additional transportation facilities of any toll bridge or other toll highway crossing, shall contain a provision that no privilege or contract rights acquired by such person, private, public, or municipal corporation, district, or political subdivision, with regard to the transport of persons or property over any such toll bridge or with regard to additional transportation facilities, shall be an element of value in any subsequent condemnation proceeding against any such person, private, public, or municipal corporation, district, or political subdivision.