52-vehicle Pile-up On A Highway A31, Emsland Autobahn, Germany

It was completed in December 2004. Construction was in part made possible by a unique method of financing: individuals, companies, towns, counties and the Netherlands donated money to accelerate the project.
Multiple-vehicle collision
A multi-vehicle collision (colloquially known as a pile-up) is a road traffic accident involving many vehicles. Generally occurring on high capacity and high speed routes such as freeways, they are one of the deadliest forms of traffic accidents. The most disastrous pile-ups have involved more than a hundred vehicles.