N.J. Stat. Ann. § 32:12-1

Three or more counties of this state whose territory is contiguous, and one of which is partially bounded by a navigable stream or river which is one of the boundaries of the state, may join together as provided in this chapter for the purpose of constructing and maintaining one or more bridges or tunnels, as may be suitable or necessary, across or under such stream or river to provide passage for traffic of all kinds.