Off-site signs visible from interstate and primary highways in unincorporated Los Angeles County are governed by the California Outdoor Advertising Act under Business and Professions Code §5200 et seq., which preempts most local rules and requires a Caltrans permit.
The California Outdoor Advertising Act, Business and Professions Code §5200 through §5486, establishes the State as the primary regulator of off-site signs visible from federally designated freeways and expressways. Caltrans Outdoor Advertising Branch issues permits, sets size and spacing standards, and inspects compliance. LA County Title 22.140.430 layers additional rules on on-premise freeway-facing signs and supplements State rules where not preempted, including illumination caps and CEQA review for new structures. Off-site digital conversions in unincorporated areas remain prohibited unless the parcel was specifically grandfathered. The County may petition Caltrans on individual permits but cannot independently authorize signs on freeway-controlled corridors. Contract cities and incorporated cities have parallel constraints.
Erecting an off-site freeway-facing sign without a Caltrans permit violates Business and Professions Code §5350, with State fines up to 5,000 dollars per day, mandatory removal, and County code enforcement adding additional Title 22 penalties.
Castaic, CA
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Side-by-side rule comparisons with other cities in Los Angeles County.
See how Castaic's freeway-facing signs rules stack up against other locations.
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