California Code, Public Utilities Code - PUC § 131056

(a) Not less than one year prior to the date of the last general election in which a retail transactions and use tax ordinance is in effect pursuant to this division, the commission or the county transportation authority administering the adopted county expenditure transportation plan shall prepare a new draft county transportation expenditure plan for approval pursuant to this chapter.

(b) Upon approval of the draft plan, the board of supervisors shall submit, at the next primary or general election, the question of whether the ordinance shall remain in effect to fund the approved plan.