Cal. VEH § 25257.2
This is the official text of Cal. VEH § 25257.2, part of California’s Vehicle Code — governs traffic laws, driver's licenses, and vehicle registration.
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Official statutory text
If a schoolbus is used for the transportation of persons of any age who are developmentally disabled, as defined by the Lanterman Developmental Disabilities Services Act (Division 4.5 (commencing with Section 4500) of the Welfare and Institutions Code), the amber light signal system, flashing red light signal system, and stop signal arm shall not be used other than as required by Sections 22112 and 22454.
Status: in_force · Read it on the official government site
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