From Devon & Cornwall Police website:
Police are appealing for witnesses following and assault on the A30 near the Launceston junction between 9.25pm and 9.30pm on Sunday 27 November.
A 56-year-old man was assaulted after he flashed his lights at a car in front of him to warn him about their dangerous driving in a speed restricted area.
The driver in front of him stopped and got out of his car and approached the man before verbally threatening him. The offender then grabbed the 56-year-old and began punching him in the shoulder causing injuries.
Further threats were made and the offender walked back to his car and ripped off his own number plate.
The suspect was driving a white hatchback, possibly a Vauxhall and is described as white, of a medium build, late 20s to early 30s and was wearing a light coloured polo jumper, with 50s styled horn-rimmed sunglasses.
If you were held up in a short stationary queue anywhere near the area or witnessed the incident please contact police at email@example.com or call 101, quoting crime reference CR/084053/16.
Alternatively, information can be passed anonymously to Crimestoppers on 0800 555111 or via the charity’s website atwww.crimestoppers-org.uk.