pile up

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When drivers do not leave a safe distance between their vehicles and the ones ahead, the potential for accidents and pile ups increases considerably.
Motorway driving continues to amaze me in that there are not more accidents, more pile ups, more fatalities.
Police were forced to close the M9 for two hours near Linlithgow, West Lothian, as dozens of cars were involved in pile ups on both sides of the carriageway.