As stated on the State of California Legislature website:
DIVISION 2. PROPERTY [654 – 1422] ( Heading of Division 2 amended by Stats. 1988, Ch. 160, Sec. 13. )
PART 4. ACQUISITION OF PROPERTY [1000 – 1422] ( Part 4 enacted 1872. )
TITLE 2. OCCUPANCY [1006 – 1009] ( Title 2 enacted 1872. )
No use by any person or persons, no matter how long continued, of any land, shall ever ripen into an easement by prescription, if the owner of such property posts at each entrance to the property or at intervals of not more than 200 feet along the boundary a sign reading substantially as follows: “Right to pass by permission, and subject to control, of owner: Section 1008, Civil Code.”
(Added by Stats. 1965, Ch. 926.)
This code can be used when someone owns a property but does not limit access, per se. In the case of the Ridge Route, the person posting these signs does not own the roadway and cannot legally post nor enforce these signs.
One of the projects we are presently working on, and an important one at that, is to have this situation corrected. The Ridge Route is a public highway on public land. Once this problem is resolved, it will be a lot easier to convince the proper authorities to reopen the roadway.