New Jersey Statutes Title 59. Claims Against Public Entities 59 § 4-3

a. A public entity shall be deemed to have actual notice of a dangerous condition within the meaning of subsection b. of section 59:4-2 if it had actual knowledge of the existence of the condition and knew or should have known of its dangerous character.

b. A public entity shall be deemed to have constructive notice of a dangerous condition within the meaning of subsection b. of section 59:4-2 only if the plaintiff establishes that the condition had existed for such a period of time and was of such an obvious nature that the public entity, in the exercise of due care, should have discovered the condition and its dangerous character.