California Code, Streets and Highways Code - SHC § 8323

At least two weeks before the day set for the hearing, the legislative body shall post conspicuously notices of vacation along the line of the street, highway, or public service easement proposed to be vacated.  The notices shall be posted not more than 300 feet apart, but at least three notices shall be posted.  If the line of the street, highway, or public service easement proposed to be vacated exceeds one mile in length, the legislative body may, in lieu of posting not more than 300 feet apart, post notices at each intersection of another street or highway with the street, highway, or public service easement to be vacated and at one point approximately midway between each intersection, but at least three notices shall be posted.