CA Pub Util Code Section 190300

The Legislature, by the enactment of this chapter, intends the additional funds provided government agencies by this chapter to supplement existing local revenues being used for transportation purposes. The government agencies shall maintain their existing commitment of local funds for transportation purposes pursuant to an ordinance adopted by the commission to enforce this section. The commission may levy a retail transactions and use tax applicable in the incorporated and unincorporated territory of the county in accordance with this chapter and Part 1.6 (commencing with Section 7251) of Division 2 of the Revenue and Taxation Code. The ordinance shall only become effective if adopted by a two-thirds vote of the commission and subsequently approved by two-thirds of the electors voting on the measure at a special election called for the purpose by the board of supervisors or at any regular election. The board of supervisors shall call the election upon being requested to do so by a resolution adopted by the commission, but not otherwise. The commission shall specify in the ordinance that not more than 1 percent of the annual amount of revenues raised by the tax may be used to fund the salaries and benefits of the staff of the commission in administering the programs funded from that tax. The ordinance shall take effect at the close of the polls on the day of election at which the proposition is adopted. The initial collection of the transactions and use tax shall take place in accordance with Section 190304. If the voters do not approve the ordinance, the board of supervisors may, at any time thereafter, submit the same, or a different, measure, if adopted by a two-thirds vote of the commission, to the voters in accordance with this division.