Permanent traffic signs should be made of metal or comparable durable material; wood may be used for large signs and also for temporary and seasonal signs; heavy cardboard may be used for special occasions or emergencies.
N.J. Stat. Ann. § 39:4-183.8
Materials
L.1941, c. 345, p. 906, s. 9
Current official text: New Jersey Legislature. Digitized from the New Jersey Legislature bulk statutes download. Reproduced from public-domain New Jersey statutes; confirm against the official source for the current text. Not legal advice.