Section 1850 Of Chapter 2. City Streets As Part Of The State And County Highway Systems From California Streets And Highways Code >> Division 2.5. >> Chapter 2.

. Any city may, by ordinance or resolution, permit the use of its streets and highways by the board of supervisors of the county, for the purpose of constructing and maintaining thereon any highway or boulevard, as part of a county system of roads within any portion of its incorporated limits.