On October 1, 2003, a multivehicle accident occurred on the approach to an Interstate 90 tollplaza near Hampshire, Illinois. About 2:57 p.m., a 1995 Freightliner tractor-trailer chassis and cargocontainer combination unit was traveling eastbound on the interstate, approaching the Hampshire-Marengo toll plaza at milepost 41.6, when it struck the rear of a 1999 Goshen GC2 25-passenger specialtybus. As both vehicles moved forward, the specialty bus struck the rear of a 2000 Chevrolet Silverado 1500pickup truck, which was pushed into the rear of a 1998 Ford conventional tractor-box trailer. As its cargocontainer and chassis began to overturn, the Freightliner also struck the upper portion of the pickup truck'sin-bed camper and the rear left side of the Ford trailer. The Freightliner and the specialty bus continuedforward and came to rest in the median.