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This dashcam footage from the United States shows a BMW 3 Series driver slam on the brakes, sparking a nasty pile-up.
Captured on a highway near the city of San Bruno, the video shows the driver of the E30-generation 3 Series hit the anchors hard (for seemingly no reason at all).
A Toyota Prius then crunches into the rear of the BMW, before an SUV slams into the back of the Prius.
Watch the footage above…
