Interstate 476 / PA Turnpike Northeastern Extension - South

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The PA Turnpike crosses over Lower Main Road and Pohopoco Creek south through the borough of Parryville.
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I-476 spans PA 248 and the Lehigh River on a high level bridge into Mahoning township.
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Turning south, Interstate 476 ascends to the Lehigh Tunnel.
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Southbound I-476 passes through the second bore added to the Lehigh Tunnel in 1989.
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South at milepost 65.7.
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The Lehigh Valley Interchange (Exit 56) joins I-476 with U.S. 22 (Lehigh Valley Thruway) midway between I-78 west and PA 309.
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Interstate 78 travels west to I-81 in Lebanon County and east around Allentown and Bethlehem to Easton and North Jersey.
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The Allentown Service Plaza lies on the west side of I-476 between I-78 and U.S. 222.
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U.S. 222 crosses over the PA Turnpike on the Trexlertown Bypass just south of the Allentown Service Plaza.
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24 miles separate the Quakertown Interchange from the Northeastern Extension south end at Interstate 276.
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Interstate 476 enters Montgomery County south near Skymount Lake.
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PA 563 (Ridge Road) spans The PA Turnpike west of Tylersport in Salford township.
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The Landsdale Interchange (Exit 31) connects I-476 with PA 63 at the community of Kulpsville in Towamencin township.
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PA 63 travels southeast from Harleysville to Lansdale, North Whales, Maple Glen and ultimately Northeast Philadelphia along Woodhaven Road.
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A second entrance ramp was built from PA 63 (Sumneytown Pike) at Old Forty Foot Road (SR 1006) to I-476 south.
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I-476 meets I-276 at the Mid-County Interchange (Exit 20). I-276 extends the Pennsylvania Turnpike mainline east from I-76 at Valley Forge to I-95 near Bristol and the Delaware River Turnpike Toll Bridge to New Jersey.
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The Pennsylvania Turnpike extends west from I-276 at Exit 326 along Interstate 76 to Harrisburg, Pittsburgh and the Ohio state line.
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The continuation of I-476 south from the Northeastern Extension onto the Mid-County Expressway is considered Exit 20. I-476 is a popular route between the west Philadelphia suburbs and I-95 at Chester.
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The cloverstack interchange joining I-476 and I-276 at Exit 20 replaced a trumpet connecting the south end of PA 9 with the Pennsylvania Turnpike mainline. The final link along I-476 opened to traffic at Plymouth Meeting in 1992.
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The Mid-County Expressway is better known as the Blue Route by locals. The ensuing ramp joins I-276 west just ahead of the Norristown Interchange (Exit 333) with Germantown Pike (SR 3053).
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A loop ramp departs for Interstate 276 east toward Fort Washington, Willow Grove, Bristol and the New Jersey Turnpike.
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