Cal. Const. art. XIX, § 3

Revenues from fees and taxes imposed by the State upon vehicles or their use or operation, over and above the costs of collection and any refunds authorized by law, shall be used for the following purposes: (a) The state administration and enforcement of laws regulating the use, operation, or registration of vehicles used upon the public streets and highways of this State, including the enforcement of traffic and vehicle laws by state agencies and the mitigation of the environmental effects of motor vehicle operation due to air and sound emissions. (b) The purposes specified in Section 2 of this article. (Sec. 3 renumbered from Sec. 2 on Nov. 2, 2010, by Prop. 22. Initiative measure.)