The total tax levied by the board of county commissioners in any unorganized township for the construction, maintenance, and improvement of any roads and bridges may not exceed eighteen mills on the dollar of the taxable valuation of the township or the amount in dollars that the township would have been entitled to levy under section 57-15-01.1 if the township had remained organized, but this does not prohibit the levy of general county road and bridge taxes in such unorganized township.
N.D.C.C. § 57-15-22