Explained in plain English
Why do crashes cause congestion?
Even a single lane closure due to a crash can create huge tailbacks. This is because the remaining lanes have to handle the same volume of traffic in a reduced space, causing a bottleneck. The M3 incident highlights how quickly traffic can build up, especially near busy interchanges like the M25.
Stories that explain this
M3 lanes closed between Woking and M25 after serious crash in SurreyThis explainer came from a news story
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