Cal. Const. art. XIX D, § 1

(a) Notwithstanding Section 8 of Article XIX, revenues derived from vehicle fees imposed under the Vehicle License Fee Law pursuant to Chapter 6 (commencing with Section 11050) of Part 5 of Division 2 of the Revenue and Taxation Code, or its successor, over and above the costs of collection and any refunds authorized by law, shall be used solely for transportation purposes, as defined by Section 11050 of the Revenue and Taxation Code, as that section read upon enactment of the Road Repair and Accountability Act of 2017.

(b) The revenues described in subdivision (a) shall not be used for the payment of principal and interest on state transportation general obligation bonds that were authorized by the voters on or before November 8, 2016, nor shall those revenues be used for payment of principal and interest on state transportation general obligation bond acts approved by the voters after that date, unless the bond act expressly authorizes that use.

(c) Except as provided in Sections 16310 and 16381 of the Government Code, as those sections read on January 1, 2018, the Legislature shall not borrow the revenues described in subdivision (a), and shall not use these revenues for purposes, or in ways, other than as authorized in subdivisions (a) or (b).