 The westbound alternate truck route follows Paper Mill Road and Bethlehem Pike.There is also a PA 73 Alt.Truck for traffic from northbound PA 309 to access westbound PA 73, following PA 309 north from PA 73 to the Pennsylvania Turnpike (I-276) interchange, where it utilizes the cloverleaf ramps to return to southbound PA 309 and head south to the PA 73 exit.