A motorist was threatened by another driver who pulled alongside him while going along the motorway.
The incident took place on the clockwise carriageway of the M25 going towards junction 10 at about 6.50am on Tuesday, January 27.
The man is believed to have been driving a blue Volkswagen Scirocco which exited the motorway at junction 10 towards the A3.
He was a well-built man, between 35 and 40 years old with dark, blond hair.
Police Constable Joshua Blackham said: "This was a busy time of day on the road with motorists driving during the morning commute.
"I would appeal for anyone who uses that route to think about whether they might have seen this incident, or the manner of driving of either vehicle in the events leading up to it."
Anyone with information should call Surrey Police on 101 quoting the reference number 45150007413.
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