Notwithstanding the provisions of any other statute, the commissioner, with the approval of the Attorney General and the Governor, is authorized to enter into agreements with the corresponding official of any adjoining state for surveys, plans, specifications, estimates and the acquisition of rights-of-way for, and for the construction and maintenance of, highways, bridges and approaches thereto crossing the state line. The provisions of such agreements may be carried out either by the commissioner or by the adjoining state as necessity, convenience or economy requires, provided no commitments or expenditures of state funds shall be made by the commissioner without the approval of the Governor.