California lawmakers recently passed a sweeping transportation bill, including updates to regulations governing windshield and window films.
The bill upholds California’s long-standing rule against driving with materials affixed to windshields and windows, but outlines several health-related exceptions.
The legislation allows clear, colorless, and transparent films to be applied to windshields, side, or rear windows if the material is designed to enhance the glass’s ability to block harmful ultraviolet A (UVA) rays. Drivers would have to carry a certificate signed by a licensed dermatologist confirming the medical necessity of protection from ultraviolet exposure.
The bill also affirms previous state allowances for sun-screening devices on front side windows when accompanied by medical documentation from a licensed physician or optometrist. The bill reiterates that these sun-screening devices approved for medical use cannot be used during darkness.
The legislation was enrolled on September 16, 2025, and now awaits the governor’s signature.
