(b) For good cause shown, such stay may be extended by the court, in its discretion, for additional periods not to exceed ninety days each; such extension order or orders, when served upon the commissioner of motor vehicles in the same manner as the original stay order, shall be binding upon him to the same extent as the original stay order for such additional period or periods.
(c) A stay order or orders issued pursuant to section 460.50 of the criminal procedure law which purport to reinstate a license during the pendency of an appeal from a conviction resulting in the suspension or revocation of a license shall, for the purposes of such reinstatement, be deemed to be issued in accordance with the provisions of this section and the ninety day stay period authorized by this section shall apply.