(a) Route 238 is from Route 680 in Fremont to Route 61 near San Lorenzo via Hayward.
(b) The relinquished former portion of Route 238 within the City of Hayward is not a state highway and is not eligible for adoption under Section 81. For the relinquished former portion of Route 238, the City of Hayward shall maintain within its jurisdiction signs directing motorists to the continuation of Route 238 or to the state highway system, as applicable, and shall ensure the continuity of traffic flow on the relinquished portion of Route 238, including any traffic signal progression.