Route 100

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PA 100 travels north from U.S. 202 outside West Chester to PA 309 at the community of Pleasant Corners. The state route joins Exton, Pottstown, Boyertown and Trexlertown along a 74.2 mile course.

PA 100 north from U.S. 202 to U.S. 30 (Exton Bypass) comprises a controlled access expressway. PA 100 also bypasses Pottstown to the west and Boyertown to the east along along controlled access arterials with grade separations at PA 724 and PA 73. The route around Trexlertown utilizes an at-grade expressway, partially alongside U.S. 222.

The Pennsylvania Department of Transportation (PennDOT) truncated PA 100 north from the Delaware state line to West Chester in 2003. The state route was also realigned east from Pottstown Pike south into West Chester onto the expressway linking with U.S. 202 in West Goshen township. PA 100 through West Chester was decommissioned in an effort to remove through traffic from the borough. Further south in Chester County, resolutions to remove PA 100 from Creek Road to dissuade truck traffic originated in 1990. All signs along the former route of PA 100 south to the First State were removed by April 2003.1 Prior to that time, PA 100 formed a multi state highway with Delaware State Route 100 south to Elsmere and Richardson Park.

Pennsylvania Route 100 North
PA 100 (Pottstown Pike) heads northwest from PA 113 (Uwchlan Avenue) at Lionville to a trumpet interchange and access road to the Pennsylvania Turnpike (I-76). 10/15/04
PA 100 (Pottstown Pike) connects Downingtown, Exton and West Chester with the Pennsylvania Turnpike. 10/15/04
Traffic partitions at the Downington Interchange for I-76 west to Harrisburg and Pittsburgh and I-76 east to I-276 at Valley Forge. An I-476 shield overlaid PA 9 for the Pennsylvania Turnpike Northeast to Allentown and Scranton. 10/15/04
Pennsylvania Route 100 South
PA 100 (Pottstown Pike) advances south from a parclo interchange with U.S. 30 (Exton Bypass) into the South Valley Hills. An abandoned railroad overpass spans Pottstown Pike ahead of a bridge for the AMTRAK Northeastern Corridor / SEPTA Regional Rail. 08/01/04
PA 100 (Pottstown Pike) was realigned in 2003 onto an expressway connector linking with U.S. 202 to the east. The former alignment continues south along Pottstown Pike (SR 3100) into the borough of West Chester. 08/01/04
PA 100 splits with Pottstown Pike at a wye interchange. Pottstown Pike (SR 3100) continues south to High Street in West Chester. PA 100 formerly traveled south from West Chester to Lenape, Pocopson and the Delaware state line at SR 100. 08/01/04
PA 100 extends 2.3 miles southeast from Pottstown Pike along a four lane expressway. The final confirming marker stands ahead of Boot Road. 08/01/04
Sound walls were added along the expressway taking PA 100 southeast to U.S. 202 in the early 2000s. Kirkland Avenue spans the state route along the West Goshen township line. 08/01/04
PA 100 concludes at a wye interchange with U.S. 202 ahead of the West Chester Bypass and U.S. 322. 08/01/04
An end sign for PA 100 was installed in 2001 along the ramp merging with U.S. 202 southbound. U.S. 202 comprises a four lane freeway bypass to the east of West Chester 08/01/04
Former PA 100 followed S Creek Road in Chadds Ford township to Chadds Ford Road in Pennsbury township. The final confirming marker preceded the Delaware state line, where PA 100 transitioned to SR 100 (Montchanin Road). 12/21/01

  1. "Route 100 loses its way through West Chester." The Philadelphia Inquirer (PA), October 9, 2003.

Photo Credits:

12/21/01, 08/01/04, 10/15/04 by AARoads

Connect with:
Interstate 76
U.S. 30
U.S. 202
U.S. 222
Route 309
State Route 100

Page Updated 01-02-2021.

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