Section 1725 Of Article 5. County Highways Within Cities From California Streets And Highways Code >> Division 2. >> Chapter 9. >> Article 5.

. Whenever a county highway has been established within a city, as provided in this article, and an extension of such highway in the unincorporated area of the county is thereafter annexed by the city, the portion annexed shall continue to be a county highway until a resolution of relinquishment is adopted in accordance with Section 1731.