Cal. Sts. & High. Code § 748

(a) Any nonconforming junkyard, as soon as the maximum federal share under Section 136 of Title 23, United States Code, is available for that purpose, shall be removed from sight of interstate or primary highways by any of the following methods to whatever extent is required, so as not to be visible from the main traveled way of any interstate or primary highway:
1. (1) Screening by natural objects, plantings, fences, or other appropriate means.
2. (2) Recycling, as defined in subdivision (j) of Section 746.
3. (3) Relocation.
(b) This section applies if any portion of such junkyard is within 1,000 feet of the nearest edge of the right-of-way and if it is visible from the main traveled way of such highway. The department shall screen such junkyards at locations on the highway right-of-way or in areas acquired for such purpose adjacent to the right-of-way or may compensate the junkyard owner for the placement of screening on the junkyard property.