In addition to the powers provided in Section 12a, the Board with the affirmative vote of 5 of its Directors may demand and direct the Board of the Regional Transportation Authority to issue Working Cash Notes at such time and in such amounts and having such maturities as the Authority deems proper, provided however any such borrowing shall have been specifically identified in the budget of the Authority as approved by the Board of the Regional Transportation Authority. Provided further, that the Board may not issue and have outstanding or demand and direct the Board of the Regional Transportation Authority to issue and have outstanding more than an aggregate of $40,000,000 in Working Cash Notes.