Witnesses of the incident – which happened at traffic lights in front of McDonald’s in Hele Road at around 11.05am on Sunday 15 August – are being sought.
The victim, a man aged in his 30s, was spat at and grabbed by his shirt and scratched following a dispute with another motorist. He sustained visible injuries.
It is believed witnesses stopped at the scene to help and took down details of the male suspect’s vehicle.
Police are urging these people to come forward.
Anyone with information is asked to call police on 101, or email email@example.com, quoting crime reference CR/070728/21.