Route 27 crosses the Raritan River on the Albany Street Bridge, which connects Highland Park on the east with New Brunswick on the west.Route 27 runs parallel to Carnegie Lake, then crosses over the Millstone River just north of the historic Kingston Bridge.It continues northeast through a mix of woodland and residences, intersecting with Promenade Boulevard, which heads east and becomes CR 522 after crossing US 1.The route continues north to an intersection of Gateway Boulevard (CR 518), where it resumes its northeast direction and heads into Kendall Park as a variable two- to four-lane road, entering denser suburban development.Past that intersection, Route 27 forms the border of Franklin Township to the west and North Brunswick to the east, passing through suburban development with some areas of farmland, seeing about 38,487 cars a day.[1][2] The road forms the border of Franklin Township and New Brunswick upon intersecting with How Lane (CR 680) becoming four-lane Somerset Street.Past this intersection, the route becomes a two-lane street that heads into Downtown New Brunswick, south of the main campus of Rutgers University.[1] Route 27 resumes heading northeast past this intersection as a four-lane road that passes by homes, entering Edison, where the name changes to Lincoln Highway.[1] Beyond this interchange, Route 27 crosses into Metuchen and becomes two-lane Essex Avenue, which turns to the east and heads through residential areas.[2] The route closely parallels the Northeast Corridor rail line and crosses into Woodbridge, widening to four lanes at this point.[3] Past the one-way pair, Route 27 resumes east on four-lane Westfield Avenue, turning north onto Broad Street.Route 27 continues north, passing under railroad tracks carrying Conrail Shared Assets Operations' Lehigh Line and NJ Transit's Raritan Valley Line and crossing Conrail Shared Assets Operations' Poinier Street Lead line/Irvington-Hillside Industrial Branch at-grade, before it comes to an intersection of Poinier Street, where the route heads east along that road to its northern terminus at an interchange with McCarter Highway (Route 21) and Broad Street.[13] In the 1953 New Jersey state highway renumbering, the southern terminus of Route 27 was cut back to Princeton to avoid the concurrency with US 206.
Route 27 southbound past Route 18 and CR 514 in New Brunswick
Route 27 northbound at CR 650 (New Dover Road) in Woodbridge Township, running parallel to the Northeast Corridor rail line