N.J. Stat. § App.A:3-33
Whenever a project contemplates work to be done upon a road or bridge within the State highway system, then any funds heretofore appropriated to the State Highway Commissioner or which may hereafter be appropriated, may be expended by the State Highway Commissioner in order to carry out the provisions of any contract with the United States Government, or its authorized official; provided, however, that funds shall be available within the appropriate budget item as provided in section 52:22-20 of the Revised Statutes. Where there are not sufficient funds available within an appropriate budget item, then the State Highway Commissioner may, with the approval of the State House Commission, transfer funds from one item to another. Where the best interests of the State require that a project, not heretofore included in a program as provided in the afore-mentioned section 52:22-20, shall be substituted for a project within a program, then the State Highway Commissioner is authorized, with the approval of the State House Commission, to make such substitution.
N.J.S. § App.A:3-33