On June 20, 1998, about 4:05 a.m., on the Pennsylvania Turnpike near Burnt Cabins, Pennsylvania, a Greyhound Lines, Inc., motorcoach traveled off the right side of the roadway into an emergency parking area. It struck the back of a parked tractor-semitrailer, which was pushed forward and struck the left side of another parked tractor-semitrailer. Of the 23 people on board the bus, the driver and 6 passengers were killed; the other 16 passengers were injured. The two occupants of the first tractorsemitrailer were injured, and the occupant of the second tractor-semitrailer was uninjured.