Route 39 is from:
(a) Route 1 near Huntington Beach to Route 72 in La Habra via Beach Boulevard.
(b) Beach Boulevard to Harbor Boulevard in La Habra via Whittier Boulevard.
(c) Whittier Boulevard in La Habra to Route 2 via Harbor Boulevard to the vicinity of Fullerton Road, then to Azusa Avenue, Azusa Avenue to San Gabriel Canyon Road, San Gabriel Avenue southbound between Azusa Avenue and San Gabriel Canyon Road, and San Gabriel Canyon Road, other than the portion of the segment described by this subdivision that is within the city limits of Azusa, Covina, and West Covina.
The relinquished former portions of Route 39 within the city limits of Azusa, Covina, and West Covina are not state highways and are not eligible for adoption under Section 81. For the relinquished former portions of Route 39, the Cities of Azusa, Covina, and West Covina shall maintain within their respective jurisdictions signs directing motorists to the continuation of Route 39.
(d) Notwithstanding subdivision (a), the commission may relinquish to the City of Buena Park the portion of Route 39 within the city limits of Buena Park from the Anaheim/Buena Park city limits to the junction with State Highway Route 5 (post mile 12.9 to post mile 15.1), on terms and conditions that the commission finds to be within the best interests of the state, if the department and the city enter into an agreement providing for that relinquishment. The following conditions shall apply upon relinquishment:
(1) The relinquishment shall become effective on the date following the county recorder’s recordation of the relinquishment resolution containing the commission’s approval of the terms and conditions of the relinquishment.
(2) On and after the effective date of the relinquishment, the portion of Route 39 relinquished under this subdivision shall cease to be a state highway and shall be ineligible for future adoption under Section 81.
(3) For the portion of Route 39 relinquished under this subdivision, the City of Buena Park shall maintain within its jurisdiction signs directing motorists to the continuation of Route 39.