Route 27 is a state highway in New Jersey, United States. It runs 38.53 mi (62.01 km) from U.S. Route 206 (US 206) in Princeton, Mercer County northeast to an interchange with Route 21 and Broad Street in Newark, Essex County. The route passes through many communities along the way, including New Brunswick, Highland Park, Edison, Metuchen, Rahway, and Elizabeth. Route 27 is a two- to four-lane undivided highway for most of its length, passing through a variety of urban and suburban environments. It intersects many roads along the way, including Route 18 in New Brunswick, Interstate 287 (I-287) in Edison, the Garden State Parkway in Woodbridge Township, Route 35 in Rahway, Route 28 in Elizabeth, and U.S. Route 22 in Newark. Route 27 crosses the Raritan River on the Albany Street Bridge, which connects Highland Park on the east with New Brunswick on the west.

U.S. Route 206 is a 130.23-mile-long (209.58 km) north–south United States highway in New Jersey and Pennsylvania, United States. Only about a half a mile of its length is in Pennsylvania; the Milford–Montague Toll Bridge carries it over the Delaware River into New Jersey, where it connects to the remainder of the route. Its southern terminus is at an intersection with US 30 and Route 54 in Hammonton. The highway's northern terminus is at an intersection with US 209 near Milford, Pennsylvania; some sources and signs show an overlap with US 209 to end at its parent route US 6. For much of its length, US 206 is a rural two-lane undivided road that passes through the Pine Barrens, agricultural areas, and the Appalachian Mountains of northwestern New Jersey, with some urban and suburban areas. The route connects several cities and towns, including Bordentown, Trenton, Princeton, Somerville, Roxbury, Netcong, and Newton. The road is known as the Disabled American Veterans Highway for much of its length.