N.J. Stat. § 27:19-10
If the board of chosen freeholders of a county, or boards of chosen freeholders of two or more counties, are chargeable by law with the construction, erection, rebuilding or repair of a viaduct or bridge, and shall wrongfully neglect to perform their duty in that behalf, by reason whereof a person shall receive injury or damage to his person or property, he may bring an action at law against the county or counties and recover judgment to the extent of the injury or damage sustained. If, however, it shall be necessary to close a viaduct or bridge and stop travel over it on account of necessary repairs, or because it is unsafe for public travel, there shall be no liability on the part of the county or counties for damages by reason of the closing of the viaduct or bridge.
N.J.S. § 27:19-10