Interstate 78 East - Phillipsburg to Bedminster Township

Interstate 78 encircles the borough of Alpha from the Delaware River eastward to Still Valley. The freeway converges with U.S. 22 east and Route 173 west at Exit 3.

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U.S. 22 joins Interstate 78 east at Exit 3 from Phillipsburg and Easton, Pennsylvania. Route 173 begins at the exchange and parallels I-78/U.S. 22 eastward along the former alignment of U.S. 22.

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Interstate 78 turns more easterly into the the directional cloverleaf interchange (Exit 3) with U.S. 22 west and Route 178 east. U.S. 22 follows a commercial arterial northwest and overtakes Route 57 along Memorial Parkway west into Phillipsburg. Route 122 (New Brunswick Avenue) stems west from U.S. 22 nearby to Alpha and Phillipsburg to the south of U.S. 22. The state route follows the original route of U.S. 22 Alternate.

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Route 173 travels three miles east from Exit 3 to the borough of Bloomsbury. The state route intertwines with I-78/U.S. 22 several times in Hunterdon County.

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East of the half diamond interchange (Exit 4 on I-78 west) with Main Street (CR 637), I-78/U.S. 22 advance to Exit 6 with Bloomsbury Road (CR 632) at Musconetcong Valley.

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Construction in 2004-05 added truck weigh stations along both sides of I-78/U.S. 22 at the original half diamond interchange with Asbury Bloomsbury Road (CR 632). Ramps were relocated further out. CR 632 runs northeast 4.5 miles to Asbury along the Musconetcong River.

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The former eastbound ramp departure of Exit 6 for Asbury Bloomsbury Road (CR 632). Warren Glen lies 3.9 miles to the southwest via Route 173 and Warren Glen Bloomsbury Road.

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I-78/U.S. 22 cross Musconetcong River ahead of a parclo B2 interchange (Exit 7) with Route 173. Rute 173 leaves Bloomsbury en route to West Portal in Bethlehem Township to the east.

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Former button copy overheads posted at Exit 7 to Route 173 in east Bloomsbury. Route 173 reaches West Portal in 2.3 miles.

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I-78/U.S. 22 traverse Musconetcong Mountain east over the next several miles. Route 173 returns to the freeway at a modified diamond interchange (Exit 12). Old U.S. 22 expands to a four lane highway from West Portal to a traffic circle with Pattenburg Road north of Exit 12.

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Exit 11 departs I-78/U.S. 22 east for Pattenburg Road (CR 614) and Baptist Church Road. Route 173 ties into Pattenburg Road north of the freeway at Strotz Road. The area roads join the three routes with Norton to the north and Pattenburg to the south.

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A pair of frontage roads accompany I-78/U.S. 22 between Exits 11 and 13. The north side frontage road doubles as Route 173 (former U.S. 22). The forthcoming ramps for Exit 12 tie into the adjacent roads for CR 635 (Perryville Road) north and south.

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Exit 12 leaves I-78/U.S. 22 east for Route 173, Norton and Jutland. The south side Frontage Road intersects County Route 635 south of Norton, and north of Perryville Road east to Jutland.

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Route 173 joins I-78/U.S. 22 between Exits 13 and 15 in Union Township. Route 173 reemerges along W Main Street at the town of Clinton via the loop ramp (Exit 15) to Pittstown Road (CR 513).

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Route 173 extends another 1.81 miles east through the Clinton town center to Route 31 near Annandale. County Route 513 leads southwest from Clinton four miles to Pittstown along the Union and Franklin Township line.

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I-78/U.S. 22 pass through Clinton ahead of Exit 16 and 17 with Route 31.

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Exit 16 links with Route 173 east for Route 31 north to Washington and High Bridge. The wye interchange brings traffic onto Route 173 ahead of Center Street and ramps with Route 31 at CR 626 (Beaver Road).

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The borough of Washington lies 11 miles to the northwest of Exit 16. Overall Route 31 travels 48.93 miles between Trenton and U.S. 46 in White Township.

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A four lane highway through Clinton Township, Route 31 expands to accommodate directional ramps with I-78/U.S. 22 near Annandale. Exit 17 joins Route 31 south two miles from Allerton and ten miles from U.S. 202 at Flemington.

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The 15 mile long overlap with U.S. 22 concludes along Interstate 78 at Exit 18. U.S. 22 diverges from I-78 for Lebanon, Whitehouse and Somerville beyond the Old Allerton Road (CR 633) over crossing.

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A wye interchange for U.S. 22 east lies opposite a westbound wye interchange with CR 626 (Beaver Avenue / former U.S. 22) through Annandale. U.S. 22 meets Interstate 78 again at its east end in Newark.

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Hunterdon County Route 523 (Oldwick Road) crosses paths with Interstate 78 seven miles east of the split with U.S. 22. CR 523 joins the freeway with Whitehouse two miles to the south and Oldwick one mile to the north.

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A diamond interchange (Exit 24) joins I-78 with CR 523 (Oldwick Road) a half mile beyond Taylors Mill Road in northern Readington Township. CR 523 leads to CR 517 north for Oldwick and Fairmount.

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North of Exit 24, County Route 523 (Oldwick Road) turns east onto Lamington Road for Lamington and Bedminster Township east of Oldwick Road.

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Continuing east through Bedminster Township, I-78 advances to a directional cloverleaf interchange (Exit 29) with Interstate 287.

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Signs for Interstate 287 reference the connections with U.S. 202/206 south into Somerville and I-80 to the north. U.S. 202/206 parallel I-287 through Pluckemin.

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Interstate 287 and adjacent U.S. 202/206 southbound travel four miles through Bridgewater Township before parting ways for Somerville and Piscataway respectively. U.S. 206 north leaves the I-287 corridor from Pluckemin nearby to Chester.

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Exit 29 departs from I-78 east ahead of the Burnt Mills Road (CR 620) over crossing. I-287 and U.S. 202 north intertwine from Somerville to Mahwah at the New York state line. Both routes reach the Morris County seat of Morristown in 15 miles. I-287 meets I-80 in 20 miles at Parsippany-Troy Hills Township.

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