The Department of Transportation shall submit a biennial statement and budget estimate as required by law, and shall limit its expenditures from the State Highway Fund during each biennial period to the total amount of the budget approved according to law; provided, that the word "expenditures" shall mean all money actually paid out or due and payable, but shall not mean liabilities or obligations incurred but not due and payable until a subsequent biennial period. The provisions of any law establishing a Legislative Assembly emergency committee shall apply to expenditures from the State Highway Fund.
ORS 366.518