In June 1977, two tractor-trailers nearly fell off the lower level after jackknifing, then going through both the roadway barrier and a mesh net next to the roadway. One of the drivers was hurt slightly, while the other driver was not hurt. The accident also involved a third tractor-trailer and two passenger cars, none of whose occupants were hurt. Accidents involving trucks dumping their cargo have also occurred on the George Washington Bridge. Watermelons, frozen chicken parts, and horse manure have all fallen onto the bridge's roadway at some point.