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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.
Pile-ups generally occur in low-visibility conditions as drivers on freeways are sometimes caught out by driving too close to the vehicle in front and not adjusting to the road conditions.
Due to the high traffic speeds on the road, if one car develops a problem and suddenly halts, those behind it cannot stop in time and may hit it. Considering that these roads often have high traffic volumes, more cars are forced into braking and skidding, darting into other lanes and in front of oncoming traffic and so more vehicles become involved, creating a chain reaction effect.
Determining the cause of such accidents is difficult for investigators and it is often impossible to tell if negligence caused the crash.
Multiple-vehicle collisions are particularly deadly as the mass of crumpled vehicles makes escape for survivors difficult. Even if a survivor is able to exit their vehicle, another car may strike them. A fire in one part of the accident can quickly spread via spilled gasoline and cover the entire crash area. Individual vehicles in a multiple-vehicle collision are often hit multiple times at high speed, increasing the risk of injury to passengers who may have survived the first impact. Collisions after the initial collision may occur from the side where the car is more vulnerable. Multiple-vehicle collisions can also overrun local firefighting, ambulance, and police services making speedy rescues more difficult. If the accident takes place in a remote area, getting medical help to it can be a daunting task.
The large scale of these accidents can close important routes for several days. The destruction and intense heat of fires can also damage roadways, particularly by melting and burning the asphalt. Bridge structures can also be weakened by the heat. A pileup inside a tunnel is most serious, as there is little means to escape the tunnel and the confined heat may damage the structure of the tunnel.
Multiple vehicle collisions can occur in the restricted courses used in motorsports as well, most commonly after a green flag (on road courses) being waved following a warm-up lap during the start of the race. Reporters and fans apply subjective guidelines as to what threshold needs to be crossed before a simple on-track incident can be described as such. NASCAR fans, for example, talk about 'The Big One', where many cars can be involved in a wreck while running close together.
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