There is an quicker way to get to Trex with far less traffic and currently no bridge closures.
http://maps.google.com/maps?saddr=PA-309+N&daddr=40.6273835,-75.5835644+...
This map starts at Rt22 and 309. The first turn off of 309 on to Hoffmansville Rd is just before the Burger King in Orefield.
Happy Trails!