 At this crossing , US 22 heads north @-@ northeast into Scotch Plains , Union County , coming to an interchange with CR 655 . The route continues northeast as a four- to five @-@ lane highway , passing near <unk> Amusement Park . The road continues east through Mountainside , turning northeast before entering Springfield , where it has an interchange with CR 509 Spur ( signed as CR 577 ) . Past this interchange , for 1 @.@ 8 miles US 22 has an unusual wide median that contains commercial businesses and numerous U @-@ turn ramps . In this area , the road comes to a level crossing with the abandoned Rahway Valley Railroad . It crosses the Rahway River into Union , where the wide median continues . The route briefly forms the northern border of Kenilworth before the median narrows back into a Jersey barrier . US 22 splits into two carriageways at the intersection with exits 140 and 140A of the Garden State Parkway and Route 82 , site of the Union <unk> . 
