Cal. Streets and Highways Code § 383

(a) Route 83 is from Route 71 to Route 10 near the City of Upland. (b) The relinquished former portion of Route 83 within the City of Upland is not a state highway. For the relinquished former portion of Route 83, the City of Upland shall ensure the continuity of traffic flow, including any traffic signal progression, and maintain signs directing motorists to the continuation of Route 83. (c) (1) Upon a determination by the commission that it is in the best interests of the state to do so, the commission may, upon terms and conditions approved by it, relinquish to the City of Ontario all or a portion of Route 83 within its jurisdiction, if the department and the city enter into an agreement providing for that relinquishment. (2) The following conditions apply upon relinquishment: (A) 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. (B) On and after the effective date of the relinquishment, the relinquished portion of Route 83 shall cease to be a state highway. (d) (1) Upon a determination by the commission that it is in the best interests of the state to do so, the commission may, upon terms and conditions approved by it, relinquish to the City of Chino all or a portion of Route 83 within its jurisdiction, if the department and the city enter into an agreement providing for that relinquishment. (2) The following conditions apply upon relinquishment: (A) 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. (B) On and after the effective date of the relinquishment, the relinquished portion of Route 83 shall cease to be a state highway. (e) The entirety of Route 83 relinquished under this section is ineligible for future adoption under Section 81.