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16 August 2011, 10:02 | Updated: 16 August 2011, 10:09
Police are trying to find a driver who stopped his car in the fast lane of the M11 motorway, before smashing the window of the car behind.
According to Cambridgeshire Police, it happened near Duxford at around 7am last Wednesday morning (10 August).
The victim, who was in a Renault Clio, gestured to the driver of a Mitsubishi Lancer who had changed lanes in front of him.
The driver of the Lancer then braked and stopped his car in the outside lane of the motorway before getting out.
The Renault driver tried to drive away, but the Lancer driver smashed a window on his car by punching it.
The Lancer driver then drove away from the scene.
PC Simon Anker said: "The motorway would have been busy and this car stopped in the 'fast lane' so I am confident many people would have seen what happened.
I would urge anyone who saw what happened to contact police and I am particularly keen to trace the driver of the Mitsubishi."
Anyone with information is asked to contact PC Anker on 0345 456 456 4.