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Two drivers were arrested on suspicion of assault following a dispute on Blue Bell Hill.
Kent Police are asking for witnesses to the row, which took place on the Maidstone bound carriageway of the A229, just past the turn off for Burham.
The drivers, a man and a woman, were behind the wheels of a Jeep Cherokee and a Vauxhall Astra van.
Both were arrested on suspicion of assault and have been released on bail while officers continue to investigate.
It happened between 2.30pm and 3pm on Tuesday, May 6.
Police believe that a driver in a white Transit van stopped to intervene and acted as a peace maker in the dispute, and officers are appealing for this man to come forward so officers can speak to him and take a statement.
PC John Hetterley from Kent Police said: “Our investigation into this incident is ongoing but we believe that, as it is a busy stretch of road, there could be lots of potential witnesses and I would like to speak to anyone who has any information that they think is relevant.
“In particular we would like to hear from the van driver who stopped at the scene as he could have key information.”
Anyone with any information is asked to contact PC Hetterley at Maidstone police station by calling 01622 604130, quoting crime reference YY/9042/14.