Pub. Util. Code, § 21206

The department shall prepare a statement of all estimated revenues of the Aeronautics Account in the State Transportation Fund and revenues available for local subventions from any other sources for the next succeeding fiscal year, together with a statement of proposed expenditures to be made to local agencies and the University of California during the next succeeding fiscal year, or obligations to be incurred in connection therewith.

The statement shall be included in the printed fiscal year budget submitted to the Legislature. Insofar as the matters to which it pertains, it shall constitute as submitted the budget submitted to the Department of Finance pursuant to Section 13320 of the Government Code, and, as to such matters, shall be administered by the Department of Finance as the fiscal year budget of the Department of Transportation under the provisions of this section and of Article 2 (commencing with Section 13320) of Chapter 3 of Part 3 of Division 3 of Title 2 of the Government Code.

Any changes or modifications in the budget described in this section shall be approved by the Director of Finance.

In the event, during an annual period, the budgetary amount approved and allocated for any purpose exceeds the amount actually necessary therefor, with a resultant available surplus, such surplus may be allocated to any other purpose or supplemental project upon the written approval of the Director of Finance.

In administering the budget, the Director of Finance shall not limit expenditures or incurrence of obligations thereunder to quarterly, semiannual, or other periods of the fiscal year.