 Upon splitting from I @-@ 78 , US 22 becomes a four @-@ lane at @-@ grade divided highway that runs through rural areas with some development and crosses New Jersey Transit ’ s Raritan Valley Line . It enters Lebanon , passing to the north of the town center . Upon leaving Lebanon , the route heads back into Clinton Township . In the community of <unk> , US 22 enters Readington Township and takes a southeasterly turn away from I @-@ 78 . Here , the road passes to the southwest of the Merck Headquarters Building before reaching the community of Whitehouse Station , where it has a short concurrency with CR 523 . Past Whitehouse Station , US 22 continues through a mix of residential and commercial areas . 
