footage shows two-car collision on UK's M20 motorway
This is the frightening moment two cars collide on a motorway in south-east England.
In the video, which dates from August 2014, a driver of a green Volkswagen Golf driving southbound in the middle lane of the M20 between Ashford and Maidstone skims a lorry driving in the inside lane.
The male driver of the Golf overcompensates, spectacularly losing control before slamming into a central reservation at speed and then colliding with the driver of a Renault Grand Scenic coming up behind.
The incident was captured on a pair of SunnyCam video recording glasses by the Renault driver, Stephen.
He ended up having weeks of physiotherapy on his shoulder as a result of the accident.
"Five seconds to make a decision," Stephen wrote on social media of the incident. "I hit the brakes as soon as I saw him hit the lorry."
Stephen adds: "I had to make sure what was around me at