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Motorists are increasingly using mounted cameras in their cars, and when things go wrong on the road, handing the video to police and insurance companies.

In one instance, a driver, who was hit from behind at high speed, struggled to stay on the road as an out-of-control car flashed past him and slammed into a concrete barrier.

A camera mounted on his windscreen captured all the action and was vital in the post-smash investigation.

He is just one of an increasing number of drivers using motion-activated mounted cameras to capture dangerous road incidents while they are behind the wheel.