Billboard Lighting: Mountain View vs San Jose
How do billboard lighting rules compare between Mountain View, CA and San Jose, CA?
Mountain View has fewer restrictions than San Jose.
Mountain View, CA
Santa Clara County
Outdoor advertising in Santa Clara County must follow Caltrans brightness rules adopted from the federal Highway Beautification Act. Digital displays cannot exceed 0.3 footcandles over ambient at the regulated measurement distance and must dim automatically at night.
View full Mountain View rules →San Jose, CA
Santa Clara County
San Jose Municipal Code Title 23 caps billboard luminance, requires automatic dimming after dusk, and prohibits animation or flashing. The Highway Advertising Control Act and Caltrans separately enforce statewide brightness rules on digital billboards visible from California freeways.
View full San Jose rules →Key Facts Comparison
| Fact | Mountain View | San Jose |
|---|---|---|
| Brightness cap | 0.3 footcandles over ambient | - |
| Change interval | Minimum four seconds | - |
| Required hardware | Automatic dimming photocell | - |
| State source | Caltrans Outdoor Advertising rules | - |
| Residential adjacent | Full-cutoff shielding required | - |
| Night brightness | - | Auto-dim required after dusk |
| Animation | - | Prohibited; static images only |
| Min dwell time | - | Typically 8 seconds per message |
| Light spillover | - | Not allowed off the sign face |
| Enforcement | - | City and Caltrans concurrent |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Who measures billboard brightness in a complaint?
Caltrans inspectors measure freeway-facing displays at a fixed distance from the sign face. The County's code-enforcement division responds to local light-trespass complaints from adjacent residential properties under Title C lighting standards.
Are static lighted billboards subject to the same dimming rule?
Static lighted billboards must still meet the 0.3 footcandle ambient cap and use shielded fixtures, but the four-second change-interval rule applies only to digital or animated message displays.
San Jose FAQ
Can a digital billboard near my San Jose home flash advertisements?
No. Animation, scrolling video, and flashing are prohibited under SJMC Title 23 and Caltrans rules. Each message must hold static for the minimum dwell time, and brightness must auto-dim after sunset to limit residential light pollution.
How do I report an over-bright billboard?
Call San Jose Code Enforcement at (408) 535-7770 for billboards on city streets. For freeway-visible displays, also file a complaint with the Caltrans District 4 Outdoor Advertising office, which can dispatch field inspectors with luminance meters.
What brightness limit applies?
California guidance for digital billboards is generally 0.3 foot-candles above ambient measured at a specified distance, with night limits well below daytime. SJMC Title 23 incorporates Caltrans-style standards and adds zoning-specific caps for displays near residential and historic areas.
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