The victim, aged in his thirties, was first hit by another car while driving southbound along the M40 between High Wycombe and Beaconsfield in Buckinghamshire last Sunday evening.
Moments after the collision another vehicle displaying flashing lights directed him to pull over and he left at junction two before stopping in a layby on the A355.
Several men then jumped out of the other vehicle and grabbed the victim out of his before assaulting him and escaping with his wallet and keys.
The man needed hospital treatment for his injuries, which included a broken nose and fractured eye socket.
His attackers are believed to have arrived in a red Nissan and a dark coloured Volvo.
The incident happened at about 9.15pm last Sunday, with details having just been released by Thames Valley Police.
Investigating officer Pc Mollie Dugmore said: ‘Impersonating a police officer is an offence that we will not tolerate, and we are appealing for information following this incident.
‘We are asking anyone with information to please call 101 quoting reference 43240506514.
‘Additionally, we ask anyone with mobile phone, CCTV or dash-cam footage from the M40 or the surrounding areas at around 9.10pm to get in touch with the force in case it has captured something which may assist this investigation.’
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