Take NE Extension of PA Turnpike to Exit #44-Lehigh Valley. Take Rt. 22 East to Rt. 309 South (less than 1/2 mile). Rt. 309 becomes I-78 East. Take Exit #57-Lehigh Street. At the traffic light at the end of the ramp, make a left onto Lehigh Street. Go to second traffic light (Downyflake Lane) and turn right. PDI is the last building on the right (just past the General Mills building and just before the traffic light at 12th St.).