County Route 509 is a county highway in the U.S. state of New Jersey. The highway exists in two segments– one 0.95-mile (1.53 km) unsigned segment exists in northern Middlesex County while the signed mainline extends 25.78 miles (41.49 km) from North Avenue in Westfield to Straight Street in Paterson.

Route 28 is a state highway in the central part of New Jersey, United States that is 26.44 mi (42.55 km) long. Its western terminus is at U.S. Route 22 in Bridgewater Township, Somerset County while its eastern terminus is at Route 27 in Elizabeth, Union County. From its western terminus, Route 28 heads east through Raritan, intersecting County Route 567 and then U.S. Route 202 and U.S. Route 206 at the Somerville Circle before heading through the central part of Somerville. Past Somerville, the route interchanges with Interstate 287 in Bridgewater Township before intersecting many 500-series county roads including County Route 525 and County Route 527 in Bound Brook, County Route 529 in Dunellen, Middlesex County, County Route 531 in Plainfield, Union County, and County Route 509 in Westfield. Route 28 continues east, intersecting Route 59 and the Garden State Parkway in Cranford before heading to Elizabeth, where it crosses Route 439 before ending at Route 27. Route 28 is a two- to four-lane road its entire length that passes through suburban areas and runs within a close distance of New Jersey Transit’s Raritan Valley Line for much of its length.