Multiple Vehicle Collision
In short
A road traffic accident involving several vehicles crashing into one another. These often occur on high-speed motorways and are frequently very dangerous.
In plain words
It is when many cars, lorries, or vans hit each other in one event. This often happens in a chain reaction on busy roads. It is sometimes called a pileup.
A simple example
A car brakes suddenly on a motorway, causing the vehicle behind to hit it, which then triggers a chain of several more cars crashing into the back of the line.
Why it matters
These accidents are much more deadly than single-car crashes because of the high speeds and number of people involved. They also cause massive traffic delays and block emergency services.
Easy to mix up
Do not confuse this with a single-vehicle accident, where only one car is involved.