Route 21 is a state highway in northern New Jersey, running 14.35 mi (23.09 km) from the Newark Airport Interchange with U.S. Route 1/9 (US 1-9) and US 22 in Newark, Essex County to an interchange with US 46 in Clifton, Passaic County. The route is a four- to six-lane divided highway known as McCarter Highway on its southern portion in Newark that serves as a connector between the Newark and Paterson areas, following the west bank of the Passaic River for much of its length. It also serves as the main north–south highway through the central part of Newark, connecting attractions in Downtown Newark with Newark Airport. The portion of Route 21 through Newark is a surface arterial that runs alongside the elevated Northeast Corridor rail line through the southern part of the city and continues north through Downtown Newark while the portion north of Downtown Newark is a freeway. Route 21 intersects many major roads including Interstate 78 (I-78), Route 27, and I-280 in Newark, Route 7 in Belleville, and Route 3 in Clifton.

Quick Facts Route 21, Route information ...

Route 21
Route information
Maintained by NJDOT
Length	14.35 mi[1] (23.09 km)
Existed	1927–present
Major junctions
South end	I-78 / US 1-9 / US 22 in Newark
Major intersections	Route 27 in Newark I-280 in Newark Route 7 in Belleville Route 3 in Clifton
North end	US 46 / Route 20 in Clifton
Location
Country	United States
State	New Jersey
Counties	Essex, Passaic
Highway system
New Jersey State Highway Routes Interstate US State Scenic Byways
← Route 20 → US 22

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Route 21 was created in 1927 to run from Newark to Belleville. In 1948, the route was extended north to Paterson. In the 1950s construction began on the freeway portion of Route 21 and it was completed in stages between Chester Avenue in Newark and Monroe Street in Passaic between 1958 and 1973. Plans were made to extend the freeway north to I-80 in Elmwood Park; however, they were opposed by residents living on the east side of the Passaic River. In the 1980s, another northern extension of the Route 21 freeway was proposed to US 46 in Clifton; this section was built between 1997 and 2000. The surface portion of Route 21 through Newark underwent many improvements in the 1990s and 2000s.

Route 21 heads north from the Newark Airport Interchange with U.S. Route 1/9 in Newark near the Newark Liberty International Airport on a six-lane freeway known as McCarter Highway. This portion of Route 21 serves to connect Newark Liberty with downtown Newark.^[2] The route interchanges with Interstate 78 and U.S. Route 22 and then crosses over Conrail Shared Assets Operations' Greenville Running Track, Lehigh Line, and Passaic and Harsimus Line and then Amtrak's Northeast Corridor rail line on a viaduct, coming to an interchange with Broad Street that provides access to Frelinghuysen Ave./Route 27.^[1][3] The route continues north, paralleling the elevated Northeast Corridor tracks that lead up to Newark Penn Station, which serves Amtrak and NJ Transit trains. At the Emmet Street intersection, Route 21 becomes a four-lane surface road and intersects Murray Street, which provides access to the Ironbound neighborhood of Newark. This section of Route 21 through the southern part of Newark has a high accident rate due to the heavy concentration of businesses and traffic lights along this portion of road.^[4] The road widens to six lanes and the route intersects County Route 510 (Market Street) near Newark Penn Station and continues north into downtown Newark, splitting from the Northeast Corridor rail line.^[1][3] It crosses Raymond Boulevard and the route meets County Route 508 (Center Street), with which it forms a concurrency.^[1]

Route 21 and County Route 508 head along the west bank of the Passaic River, passing by the New Jersey Performing Arts Center. County Route 508 splits from Route 21 by heading east on Bridge Street, crossing the Passaic River, and Route 21 continues north, passing by the former site of Bears & Eagles Riverfront Stadium. After passing under NJ Transit's Montclair-Boonton Line/Morris & Essex Lines and interchanging with Interstate 280, the route intersects County Route 506 Spur (Clay Street). Past the intersection with 3rd Avenue, Route 21 becomes a six-lane freeway. After about a quarter mile, the northbound side swings under the southbound side and the freeway becomes double-decker, passes by Mt. Pleasant Cemetery, and returns to single-decker configuration. It then interchanges with Chester Avenue/Riverside Avenue with a southbound exit and northbound entrance before passing over Norfolk Southern's Newark Industrial Track line. Route 21 comes to a northbound exit and southbound entrance for Grafton Avenue and Mill Street; this interchange actually connects with the original McCarter Highway, a street that retains this name and acts as a service road to Route 21 for a few blocks in this area, near several industries. Route 21 briefly becomes a double-decker freeway again past the latter interchange and passes under Norfolk Southern's Boonton Line, before crossing into Belleville at the Second River crossing.^[1][3] The freeway features a southbound exit for Mill Street and a northbound exit for Route 7 and County Route 506 (Rutgers Street/Belleville Turnpike) as it passes by houses on the left side of the freeway. Route 21 features an interchange with Main Street that has a southbound exit and an entrance in both directions. It enters Nutley where the freeway interchanges with County Route 646 (Park Avenue), continuing north through residential areas along the Passaic River.^[1][3]

As Route 21 crosses into Clifton, Passaic County, it passes under NJ Transit's Main Line and comes to an interchange with Route 3. North of this point, the freeway comes to a northbound exit and southbound entrance for southbound County Route 624 (River Road), passing through residential neighborhoods, and enters Passaic. In Passaic, Route 21 interchanges with County Route 608 (Brook Avenue), County Route 614 (Van Houten Avenue), and County Route 624. The route features an interchange with County Route 624 (River Drive) and County Route 601 (Main Avenue) and meets State Street at a partial interchange with a northbound exit and southbound entrance. This interchange provides access to the Union Avenue Bridge over the Passaic. Route 21 heads farther to the west of the Passaic River, passing through industrial and residential areas of Passaic. The freeway comes to an interchange that provides access to County Route 619 (Market Street), Dayton Avenue, and Monroe Street. Route 21 continues to the north and resumes along the west bank of the Passaic River, narrowing to four lanes and crossing back into Clifton. Upon entering Clifton, the route comes to an interchange with Ackerman Avenue. The freeway heads to the northwest, passing by a park and featuring a southbound exit and northbound entrance for Lexington Avenue before ending at an interchange with U.S. Route 46.^[1][3]

Route 21 history starts in 1927 with the New Jersey highway renumbering plan.^[5][6] At that time it was set up as a surface roadway running through Newark and Belleville, with at-grade interchanges with local streets. This surface road eventually extended to Paterson.^[7]

From the late 1950s through the early 1970s, much of the highway north of Newark was rebuilt as a limited-interchange freeway., through most of its portion in the City of Passaic. The remaining portion through downtown Passaic and the Botany Village portion of Clifton was not constructed until the last four years of the 20th century.^[8]

Further improvements to the remaining surface portion were made to the Newark portion, though most of it remains as city streets.^[9][10]

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