N.Y. General Business Law § 599-a: Prohibition on sale

§ 599-a. Prohibition on sale. It shall be unlawful for any person,

firm, association or corporation to sell, lease, or offer for sale or

hire for use in this state any traffic control device unless it conforms

to the current manual and specifications for a uniform system of

traffic-control devices maintained by the department of transportation

or unless a certificate of approval has been issued by the commissioner

of transportation.