 East of I @-@ 287 , US 22 continues east as a four @-@ lane divided highway passing to the south of the Watchung Mountains . The route then has an interchange with CR 525 , where the wide grassy median narrows to a Jersey barrier . The road continues through wooded surroundings and passes through a portion of Bound Brook , widening back to six lanes before meeting CR 527 at an interchange . From here , the route takes a northeasterly course , entering Bridgewater Township again and narrowing to four lanes before crossing into Green Brook Township while designated a short distance north of the Middlesex @-@ Somerset County border . US 22 continues through business areas as a highway with jughandles , crossing CR 529 . In North Plainfield , the route widens to six lanes and has an interchange with CR 531 . Past this interchange , the road continues along the border of Watchung to the west and North Plainfield to the southeast before crossing Green Brook . 
