N.J. Stat. Ann. § 51:12-4

All transparent glass doors or adjacent fixed glass panels subject to this act, and all doors or adjacent fixed glass panels which may reasonably be mistaken for a means of egress or ingress constructed of safety glazing material shall be posted, painted or otherwise marked in such a manner as to alert any person attempting to pass through the doorway that such door is opened or closed, or that such adjacent fixed glass panel, is, in fact, not a door. Such doors or adjacent fixed glass panels shall be marked in accordance with rules and regulations prescribed by the Commissioner of the Department of Community Affairs.