Interstate 78 East - Lehigh / Northampton Counties

PA 863 (Golden Key Road) joins I-78/U.S. 22 at a diamond interchange (Exit 45) east of New Smithville.
04/23/04

PA 863 (Golden Key Road) travels 10.5 miles north from Exit 45 to Hynesmanville, Seiberlingville and PA 143 at Lynnport.
04/23/04

PA 863 follows Independent Road south from adjacent Old U.S. 22, 3.3 miles to U.S. 222 near Newton.
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04/23/04

I-78/U.S. 22 advance east into Upper Macungie township to a cloverleaf interchange (Exit 49) with PA 100.
04/23/04

Fogelsville lies just north of Exit 49B. Unincorporated Trexlertown is 2.4 miles south of I-78/U.S. 22 on PA 100.
04/23/04

PA 100 travels south to Macungie, Pottstown and Exton.
04/23/04

North from I-78/U.S. 22, PA 100 continues 8.5 miles to Claussville, Lyon Valley and PA 309 near Pleasant Corners.
04/23/04

I-78 and U.S. 22 split at a wye interchange (Exit 51). U.S. 22 extends east along the Lehigh Valley Thruway to the Lehigh Valley Interchange with the Pennsylvania Turnpike Northeastern Extension (I-476) and PA 309 south of Walbert.
08/08/04

08/08/04

PA 309 south combines with I-78 around the south side of Allentown. PA 309 continues along a freeway north to U.S. 22 in South Whitehall township.
04/23/04

Representing the former alignment of I-78, U.S. 22 (Lehigh Valley Thruway) runs across the north side of the Allentown, Bethlehem and Easton metropolitan area. I-78 runs to the south and was completed in November 1989.
04/23/04

U.S. 22 leads directly to Lehigh Valley International Airport (ABE) in Hanover township. PA 378 spurs south from U.S. 22 near the airport to the Bethlehem city center.
04/23/04

I-78 angles southeast from U.S. 22 to the wye interchange with PA 309.
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04/23/04

I-78/PA 309 meet the north end of U.S. 222 (Hamilton Boulevard) at Exit 54.
04/23/04

U.S. 222 concludes along the Lower Macungie and South Whitehall township line west of Dorneyville and Allentown.
04/23/04

U.S. 222 travels west to Trexlertown and Kutzville and south to Reading, Lancaster and Conowingo, Maryland.
04/23/04

Hamilton Boulevard extends east from U.S. 222 and I-78/PA 309 as PA 222. PA 222 continues along Hamilton Avenue to the Allentown city center.
04/23/04

Prior to 1960, U.S. 222 continued east to U.S. 22 in Allentown. The route was realigned onto PA 309 north to U.S. 22 (Lehigh Valley Thruway) and then subsequently truncated to the parclo interchange at Exit 54.
08/08/04

Exit 54 leaves I-78/PA 309 east for U.S. 222 south to Wescosville and Trexlertown and PA 222 north to Dorney Park & Wildwater Kingdom and Allentown.
04/23/04

I-78/PA 309 proceed east to Exit 55 for PA 29 south and Cedar Crest Boulevard (SR 1019) north in Salisbury township.
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04/23/04

The southern section of PA 29 originates at the parclo A2 interchange (Exit 53) with I-78/PA 309. The state route runs south to Emmaus, Phoenixville and U.S. 30 at Malvern.
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04/23/04

Cedar Crest Boulevard (SR 1019) extends north from PA 29 to Dorneyville, Cedar Crest College and west Allentown.
04/23/04

I-78/PA 309 lower to cross Little Lehigh Creek and Lehigh Parkway on the ensuing stretch.
04/23/04

I-78/PA 309 passes south of Allentown Queen City Municipal Airport (XLL) ahead of the six-ramp parclo interchange (Exit 57) with Lehigh Street (SR 2005).
04/23/04

Quakertown lies beyond the split with I-78 along PA 309 in northern Bucks County.
04/23/04

08/08/04

Lehigh Street comprises a commercial boulevard south from Exit 57 to the borough of Emmaus. Lehigh Street north becomes a part of PA 145 at the Fairview neighborhood in Allentown.
04/23/04

Leaving the Allentown city limits, I-78/PA 309 continue to a half diamond interchange (Exit 59) with W Rock Road at Summit Lawn.
04/23/04

PA 145 heads south from 4th Street in Allentown to parallel I-78 along Pike Avenue at Summit Lawn.
04/23/04

PA 309 branches south from Interstate 78 for Coopersburg, Quakertown, Sellersville, Montgomeryville and Ambler.
04/23/04

Interstate 78 reduces to four lanes east of the split with PA 309 at Exit 60. PA 309 provides an alternate route to the Pennsylvania Turnpike Northeastern Extension (I-476) south to Philadelphia. The four lane highway reaches Fort Washington in 30 miles.
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04/23/04

I-78 continues seven miles from the split with PA 309 to PA 412 (Hellertown Road) at Exit 67. This stretch crosses PA 378 without access beyond the Northampton County line.
04/23/04

PA 412 (Hellertown Road) arcs northwest from Exit 67 to the South Side Historic District in Bethlehem, north of Lehigh University.
08/08/04

PA 412 follows Main Street south into the borough of Hellertown. The state route turns east from Leithsville to Springtown and PA 611 in Bucks County.
04/23/04

PA 412 concludes 3.4 miles north of the folded diamond interchange (Exit 67) at PA 378 (Wyandotte Street) south of the Bethlehem city center.
04/23/04

PA 33 constitutes a freeway joining the Lehigh Valley with U.S. 209 north to Stroudsburg and Interstate 80 west to the Pocono Mountains.
08/08/04

PA 33 connects with U.S. 22 (Lehigh Valley Thruway) between Easton and Bethlehem three miles north of Exit 71.
08/08/04

09/01/05

Interstate 78 parallels the Lehigh River northeast through the borough of Glendon to Exit 75 with Morgan Hill Road (SR 2005).
09/01/05

The diamond interchange with Morgan Hill Road / Philadelphia Road is the last exit before the Delaware River and New Jersey state line.
09/01/05

Philadelphia Road (SR 2005) leads north from Exit 75 into the city of Easton. SR 2005 continues along St. John Street and Smith Avenue to PA 611 (Lackawanna Trail) south of Downtown.
09/01/05

PA 611 runs along the Delaware River between 3rd Street in Easton and Kintnersville in northern Bucks County.
09/01/05

Formerly U.S. 611, PA 611 travels south to Plumsteadville, Doylestown, Warminster and Willow Grove in the north Philadelphia suburbs.
09/01/05

North from Easton, PA 611 leads to Martins Creek, Stroudsburg and Mount Pocono.
09/01/05

Interstate 78 crosses the Delaware River to Alpha, New Jersey over the succeeding 1.75 miles.
08/08/04

Tolls are collected along I-78 westbound by the Delaware River Joint Toll Bridge Commission for the crossing into New Jersey. The forthcoming span opened to traffic on November 21, 1989. 1,222 feet in length, the crossing consists of a twin, four girder, 7-span continuous structure.¹
08/08/04