Cal. Const. art. XIX A, § 1

(a) The Legislature shall not borrow revenues from the Public Transportation Account, or any successor account, and shall not use these revenues for purposes, or in ways, other than those specifically permitted by this article.
(b) The Public Transportation Account in the State Transportation Fund, or any successor account, is a trust fund. The Legislature may not change the status of the Public Transportation Account as a trust fund. Funds in the Public Transportation Account may not be loaned or otherwise transferred to the General Fund or any other fund or account in the State Treasury.
(c) All revenues specified in paragraphs (1) through (3), inclusive, of subdivision (a) of Section 7102 of the Revenue and Taxation Code, as that section read on June 1, 2001, shall be deposited no less than quarterly into the Public Transportation Account (Section 99310 of the Public Utilities Code), or its successor. The Legislature may not take any action which temporarily or permanently diverts or appropriates these revenues for purposes other than those described in subdivision (d), or delays, defers, suspends, or otherwise interrupts the quarterly deposit of these funds into the Public Transportation Account.
(d) Funds in the Public Transportation Account may only be used for transportation planning and mass transportation purposes. The revenues described in subdivision (c) are hereby continuously appropriated to the Controller without regard to fiscal years for allocation as follows:
1. (1) Fifty percent pursuant to subdivisions (a) through (f), inclusive, of Section 99315 of the Public Utilities Code, as that section read on July 30, 2009.
2. (2) Twenty-five percent pursuant to subdivision (b) of Section 99312 of the Public Utilities Code, as that section read on July 30, 2009.
3. (3) Twenty-five percent pursuant to subdivision (c) of Section 99312 of the Public Utilities Code, as that section read on July 30, 2009.
(e) For purposes of paragraph (1) of subdivision (d), “transportation planning” means only the purposes described in subdivisions (c) through (f), inclusive, of Section 99315 of the Public Utilities Code, as that section read on July 30, 2009.
(f) For purposes of this article, “mass transportation,” “public transit,” and “mass transit” have the same meaning as “public transportation.” “Public transportation” means:
1. (1)
  1. (A) Surface transportation service provided to the general public, complementary paratransit service provided to persons with disabilities as required by 42 U.S.C. 12143, or similar transportation provided to people with disabilities or the elderly; (B) operated by bus, rail, ferry, or other conveyance on a fixed route, demand response, or otherwise regularly available basis; (C) generally for which a fare is charged; and (D) provided by any transit district, included transit district, municipal operator, included municipal operator, eligible municipal operator, or transit development board, as those terms were defined in Article 1 of Chapter 4 of Part 11 of Division 10 of the Public Utilities Code on January 1, 2009, a joint powers authority formed to provide mass transportation services, an agency described in subdivision (f) of Section 15975 of the Government Code, as that section read on January 1, 2009, any recipient of funds under Sections 99260, 99260.7, 99275, or subdivision (c) of Section 99400 of the Public Utilities Code, as those sections read on January 1, 2009, or a consolidated agency as defined in Section 132353.1 of the Public Utilities Code, as that section read on January 1, 2009.
2. (2) Surface transportation service provided by the Department of Transportation pursuant to subdivision (a) of Section 99315 of the Public Utilities Code, as that section read on July 30, 2009.
3. (3) Public transit capital improvement projects, including those identified in subdivision (b) of Section 99315 of the Public Utilities Code, as that section read on July 30, 2009.
(g) All revenues specified in Sections 6051.8 and 6201.8 of the Revenue and Taxation Code, as those sections read on January 1, 2018, shall be deposited no less than quarterly into the Public Transportation Account, or its successor. Except as provided in Sections 16310 and 16381 of the Government Code, as those sections read on January 1, 2018, the Legislature may not take any action that temporarily or permanently diverts or appropriates these revenues for purposes other than those described in subdivision (d), or delays, defers, suspends, or otherwise interrupts the quarterly deposit of these revenues into the Public Transportation Account.