Thames Valley Police are looking for a man who assaulted a motorist for overtaking him on the road.
The 24-year-old victim, was driving the back roads from Nash towards Wolverton via Stony Stratford at about 11.30pm on Wednesday, April 23.
He manoeuvred to overtake a slower moving vehicle, a white VW Scirocco.
The driver of the VW appeared to take exception to the manoeuvre and began to tailgate the victim’s car.
The victim then stopped in Stratford Road at the junction with V5 Great Monks Street.
The offender stopped his vehicle, walked towards the victim and punched him through the car window.
The victim received a cut to his left cheek and was treated at Milton Keynes Hospital.
Police are looking for a white man, in his thirties, about 6ft 2in tall, with a shaven head, wearing a tight t-shirt and jeans, who they believe to be the offender.
Police believe there were two passengers in the offender’s vehicle, a blonde woman in the front passenger seat and a child aged about five in one of the back seats.
A dark coloured BMW, which was behind the victim’s car, may have seen the assault.
Investigating officer, PC Terry Capel, said: “I would appeal to anyone who witnessed the incident, especially the driver of the BMW who was behind the victim’s vehicle prior to the incident to contact police.
“Further, if you recognise the description of the offender, their vehicle or the passengers in the car then police call us, or Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org.
“No personal details are taken, information is not traced or recorded and you will not go to court.
“Following the event the VW travelled back towards Stony Stratford, please contact police if you think you saw the vehicle after the incident.”