 For two small stretches – in Clifton at the interchange with Route 19, and in Paterson as it crosses over the Passaic River – CR 509 splits into separate northbound and southbound alignments.CR 509 intersects with the Garden State Parkway at exit 138 in Kenilworth.The unsigned Middlesex County segment begins at the intersection of Park Avenue (CR 531) and Maple Avenue (CR 602) in South Plainfield.