California Code, Streets and Highways Code - SHC § 30804

The department may provide as a condition or limitation in any franchise granted pursuant to this article for the purchase or retaking of any toll bridge, toll road, or toll ferry constructed or established by virtue of a franchise issued pursuant to this article, upon such terms and conditions as are determined by the department at the time of the execution of the franchise.  The conditions and limitations upon which any franchise is granted shall be set forth in full in the instrument executed evidencing the granting of the franchise.