 Upon crossing Green Brook , Route 28 enters Middlesex in Middlesex County , where it becomes a four @-@ lane undivided road that continues northeast through residential neighborhoods , intersecting County Route 622 ( Raritan Avenue ) . The route heads into a mix of residences and businesses , turning more to the northeast and becoming Bound Brook Avenue at the intersection with Marlborough Avenue . It intersects County Route 607 ( Lincoln Avenue ) , where Route 28 narrows to two lanes , and <unk> Road before crossing into Dunellen . Here , Route 28 heads east through residential and commercial areas before turning northeast to closely parallel New Jersey Transit ’ s Raritan Valley Line ( which runs to the south of the route ) as North Avenue . The route crosses County Route 529 ( Washington Avenue ) in the downtown area of Dunellen . 
