Dashcam video captures shocking undertake - with severe consequences

This footage shows the moment the driver of a Mini Cooper performs a very risky manoeuvre on a fast-moving A-road, and immediately regrets it.

The footage begins with the camera car in the outside lane, overtaking a string of cars on the Dorset Way in Poole. As the video progresses, following traffic becomes impatient, and the car is undertaken by a BMW 3 Series Touring.