Pennsylvania State Route 309 is a Pennsylvania (USA) highway which runs for 132 miles. It runs from Oak Lane, Pennsylvania to Bowman Creek, Pennsylvania. Route 309 is a principal route since it runs from the Philadelphia, Pennsylvania area to The Poconos mountains. This highway was signed in 1968 & this was a replacement to U.S. Highway 309 which was decommissioned.
Wyoming Valley
After 16 years of construction, PennDot completed a seven-mile expansion of 309 in 1992, named the Cross Valley Expressway, which begins at Exit 170B off Interstate 81 in Wilkes-Barre and ends in Trucksville, with six highway exits in between which include outlets to portions of W-B and surrounding suburban towns. A bridge over the Susquehanna River connects three city exits with three suburban exits. In Trucksville, the expressway ends yet Route 309 itself still continues into Shavertown and Dallas.
Allentown/Philadelphia
PA-309 parrallels the Northeast Extension of the Pennsylvania Turnpike for most of its duration. Between Philadelphia and Allentown the road is a very high volume 4-lane highway which alternates several times between a normal road and a freeway. Most of the road is surrounded on either side by large commercial developments, particularly in the areas around Montgomeryville and Quakertown. For the most part PA-309 avoids going through towns with the exception of Coopersburg, where it is reduced to a narrower 4-lane road with no turn lanes or shoulders.