California Code, Streets and Highways Code - SHC § 355

(a) Route 55 is from the south end of Newport Beach Channel Bridge to Route 91 in Santa Ana Canyon.

(b) The relinquished former portions of Route 55 within the City of Newport Beach are not state highways and are not eligible for adoption under Section 81. For the relinquished former portions of Route 55, the City of Newport Beach shall maintain within its jurisdiction signs directing motorists to the continuation of Route 55. The City of Newport Beach shall ensure the continuity of traffic flow on the relinquished former portions of Route 1 within its jurisdiction, including, but not limited to, any traffic signal progression.