A deadly multiple-vehicle crash involving a FedEx double tractor-trailer closed a major Pennsylvania interstate Tuesday morning. The wreck at mile-marker 41.1 in Greenwich Township near the line between Berks and Lehigh counties, which included another big rig and a car, closed westbound Interstate 78 between Exit 40 (Pennsylvania Route 737) and Exit 45 (Pennsylvania Route 863) around 4:30 a.m., said Pennsylvania State Police.About two hours later, the wreckage remained on the roadway, one FedEx truck on its side -- part of the trailer torn away.