Watch police officer barrel roll to avoid collision with distracted driver

A dashcam video has caught the moment a police officer in America had to barrel roll to get out of the way of a distracted driver.

A police car was parked on the slip road off a dual carriageway while an officer was investigating a recent incident. As the policeman walks around the front of his vehicle to get inside, a distracted driver in a white saloon - believed to be a Nissan Altima - approaches from behind.