Cal. Sts. & Hy. Code § 149.3
The department may undertake the construction of exclusive or preferential lane facilities pursuant to a cooperative agreement with any public or private agency that provides mass transit services. Such cooperative agreement shall establish such geometric design standards, scheduling, reservations, restrictions, and conditions as the department deems necessary or desirable. Provisions may also be made for electrification or use of other power sources under such terms and conditions as the department deems necessary to accomplish the objectives of this section. Additionally, any such agreement shall provide for the payment of compensation where required by other provisions of law or where otherwise deemed appropriate.
Ca. Sts. and High. Code § 149.3