(b) No provision of this chapter shall be deemed to require that such manual contain authority for the future installation of any specific kind or type of traffic-control device or combination of traffic-control devices which in the judgment of the department of transportation does not conform to such nationally accepted standards.

(c) No state or local authority shall hereafter fabricate or purchase any traffic-control device that does not conform to the current manual and specifications as amended from time to time. No state or local authority shall hereafter install any traffic-control device that does not conform to the current manual and specifications as amended from time to time, except that devices that are on order or on hand and serviceable or operable may be installed and used until the phase-in compliance date specified in the MUTCD. No state or local authority shall continue to use any traffic-control device that does not conform to the current manual and specifications as amended from time to time beyond the phase-in compliance date specified in the MUTCD, except that a city having a population in excess of one million shall conform to the state manual and specifications only insofar as such local authority in its discretion deems practicable.

(d) No person, firm, association or corporation shall sell, lease, or offer for sale or hire for use in this state any traffic control device that does not conform to the current manual and specifications as amended from time to time, or unless a certificate of approval has been issued by the commissioner of transportation pursuant to the provisions of section five hundred ninety-nine-b of the general business law. The provisions of this subdivision shall not apply to the sale, lease or offer for sale or hire to a city having a population in excess of one million.