Pennsylvania State Route 309 is a north-south highway in Lehigh County. It runs from the Lehigh/Bucks County Line, near Zionhill, to the Lehigh/Schuylkill County Line, north of Lynnport. PA St Rt 309 passes through the following towns in Lehigh County. Coopersburg Lanark Dorneyville Wescosville Cetronia Wennersville Schnecksville Pleasant Corner PA St Rt 309 is multi-plexed in Lehigh County. Interstate 78, from near Lanark, to near Centronia. PA St Rt 309 crosses the following highways in Lehigh County. Pennsylvania State Route 378, near Coopersburg. Interstate 78, near Lanark. Pennsylvania State Route 145, near Lanark. Pennsylvania State Route 29, near Dorneyville. U.S. Rt. 222, at Dorneyville. Pennsylvania State Route 222, at Dorneyville. Interstate 78, at Dorneyville. U.S. Rt. 22, at Wennersville. Interstate 476, (Pennsylvania Turnpike-NE Ext.) near Wennersville. (NO Interchange) Pennsylvania State Route 873, at Schnecksville. Pennsylvania State Route 100, at Pleasant Corner. Pennsylvania State Route 143, near New Tripoli.
A BGS on NB U.S. Rt. 222. A BGS on NB U.S. Rt. 222. A BGS on WB U.S. Rt. 22. A BGS on WB U.S. Rt. 22. A BGS on SB I-476.
