Route 27 is a state highway in New Jersey, United States. It runs 38.5 mi (61.96 km) from US 206 in Princeton, Mercer County, northeast to an interchange with McCarter Highway 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 and interchanges many roads along the way, including Route 18 in New Brunswick, I-287 in Edison, the Garden State Parkway in Woodbridge, 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.
Route 29 is a state highway in the U.S. state of New Jersey. Signed north-south, it runs 34.76 miles (55.94 km) from an interchange with Interstate 295 (I-295) in Hamilton Township in Mercer County, where the road continues east as I-195, northwest to Route 12 in Frenchtown, Hunterdon County. Between the southern terminus and I-295 in Ewing Township, the route is a mix of expressway and boulevard that runs along the Delaware River through Trenton. This section includes a truck-restricted tunnel that was built along the river near historic houses and Riverview Cemetery. North of I-295, Route 29 turns into a scenic and mostly two-lane highway. North of the South Trenton Tunnel, it is designated the Delaware River Scenic Byway, a New Jersey Scenic Byway and National Scenic Byway, that follows the Delaware River in mostly rural sections of Mercer County and Hunterdon County. The obsolete Delaware & Raritan Canal usually stands between the river and the highway. Most sections of this portion of Route 29 are completely shaded due to the tree canopy. Route 29 also has a spur, Route 129, which connects Route 29 to U.S. Route 1 (US 1) in Trenton.
Route 31 is a state highway in New Jersey, United States. It runs 48.93 miles (78.75 km) from US 206/US 1 Bus. in Trenton, Mercer County, north to an intersection with US 46 in the Buttzville section of White Township, Warren County. Along the way, Route 31 heads through the communities of Flemington, Clinton, and Washington. Most of the highway is state-maintained; however, the section within the city limits of Trenton is maintained by the city. Much of Route 31 is a two-lane highway that passes through farmland, woodland, and mountainous areas. Two portions of the route—from Trenton to Pennington and from Ringoes to Clinton—consist of more development.
Route 156 is a 1.28-mile (2.06 km) long state highway in New Jersey, United States. It is a short connector in Yardville, a census-designated place which is part of Hamilton Township, Mercer County. It is an old two-lane alignment of U.S. Route 130 that was bypassed by a new multi-lane highway a short distance to the east in the 1950s, and designated just before the 1953 renumbering of state highways. The route intersects Route 130 at both termini; it carries local traffic to and from US 130 southbound through Yardville. The route has remained mainly intact since 1953.
U.S. Route 206 is a 130.2-mile-long (209.5 km) north–south U.S. highway in New Jersey and Pennsylvania, United States. Only about a 1⁄2 mile (0.80 km) 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 of White Horse Pike and Bellevue Avenue in Hammonton. The highway's northern terminus is at an intersection of 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.
Interstate 295 (I-295) in Delaware, New Jersey, and Pennsylvania is an auxiliary Interstate Highway, designated as a bypass around Philadelphia, and a partial beltway of Trenton.
U.S. Route 1 Business is a four-lane surface road that provides an alternate route to the Trenton Freeway (US 1) northeast of Trenton in Mercer County, New Jersey. The route is 2.73 miles (4.39 km) long and runs between US 1 in Trenton and Lawrence Township. On the border of Trenton and Lawrence Township, US 1 Bus. intersects the northbound direction of US 206 at the Brunswick Circle. The route was once part of a longer U.S. Route 1 Alternate, which continued southwest through downtown Trenton and into Morrisville, Pennsylvania.
County Route 579 is a county highway in the U.S. state of New Jersey. The highway extends 37.24 miles (59.93 km) from John Fitch Parkway in Trenton to Route 173 in Greenwich Township.
County Route 571 is a county highway in the U.S. state of New Jersey. The highway extends 43.96 miles (70.75 km) from Route 37 in Toms River Township to Route 27 in Princeton. Though it is designated a north–south county route by the New Jersey Department of Transportation (NJDOT), it is signed both as north–south and east–west inconsistently.
County Route 569 is a county highway in the U.S. state of New Jersey. The highway extends 8.53 miles (13.73 km) from Quakerbridge Road in Lawrence Township to Broad Street in Hopewell Borough.
County Route 561 is a county highway in the U.S. state of New Jersey. The highway extends 50.95 miles (82.00 km) from New York Road in Galloway Township to Federal Street in Camden. Though it is designated a north-south county route by the New Jersey Department of Transportation, it is signed both north-south and east-west inconsistently.
County Route 551 is a county highway in the U.S. state of New Jersey. The highway extends 34.57 miles (55.64 km) from Pennsville-Salem Road in Pennsville Township to Penn Street in Camden.
County Route 549 (CR 549) is a county highway in the U.S. state of New Jersey. The highway extends 17.8 miles (28.6 km) from Main Street (Route 166) and Water Street (CR 527) in Toms River to Lakewood-Farmimgdale Road (CR 547) and Old Tavern Road (CR 21) in Howell. The highway has the distinction of being the only 500-series route left with two separate spur routes.
County Route 546 is a county highway in the U.S. state of New Jersey. The highway begins at Route 29 within the Titusville, New Jersey section of Hopewell Township and extends 9.98 miles (16.06 km) to U.S. Route 1 (US 1) in Lawrence Township. The road runs entirely within Mercer County.
County Route 539 is a county highway in the U.S. state of New Jersey. The highway extends 54.32 miles (87.42 km) from Main Street in Tuckerton to CR 535 in Cranbury Township. Much of the two-lane route passes through isolated areas of the Pine Barrens and the eastern end of the Fort Dix entity of Joint Base McGuire–Dix–Lakehurst. In these stretches, the route has a speed limit of 55 miles per hour (89 km/h), one of the few two-lane roads in the state to carry a 55 mph limit. CR 539 passes through three boroughs: Tuckerton, Allentown, and Hightstown. Other than those boroughs, the route travels mainly through rural townships.
County Route 533 is a county highway in the U.S. state of New Jersey. The highway extends 32.7 miles (52.6 km) from the White Horse Circle, in Hamilton to Lincoln Boulevard on the border of Bound Brook and Middlesex Borough. CR 533 shares a long concurrency with US 206 through Princeton and Montgomery, while portions of the roadway in Somerset County are part of the Millstone River Valley Scenic Byway.
County Route 530 is a county highway in the U.S. state of New Jersey. The highway extends 31.21 miles from US 206 and Route 38 in Southampton Township to Water Street in Toms River Township.
County Route 526 is a county highway in the U.S. state of New Jersey. The highway extends 35.56 miles (57.23 km) from Princeton–Hightstown Road in West Windsor Township to Lanes Mill Road in Lakewood Township.
County Route 524 is a county highway in the U.S. state of New Jersey. The highway extends 39.90 miles (64.21 km) from the White Horse Circle in Hamilton Township to Route 71 in Spring Lake Heights.
County Route 511 is a county highway in the U.S. state of New Jersey. The highway extends 37.44 miles (60.25 km) from Columbia Avenue in Morris Township to the New York state line in West Milford where the road continues as New York State Route 210.
US 206 in Trenton 
CR 546 in Lawrence Township 
I-295 in Lawrence Township
CR 569 in Lawrence Township
CR 533 in Princeton 
Route 27 in Princeton
