In the event that any allocation, if approved in accordance with Section 29532, would cause the county to incur any indebtedness or liability in any year in excess of the money in the local transportation fund for such year, the board of supervisors shall, upon notification from the transportation planning agency designated in Section 29532, call an election pursuant to Article 7 (commencing with Section 99320) of Chapter 4 of Part 11 of Division 10 of the Public Utilities Code. Such election may be consolidated with a general election or a direct primary election. The cost of such election shall, upon approval of the transportation planning agency designated in Section 29532, be paid from the transportation fund.