A 43-year-old man was assaulted in Ericsson Close, Ashby Fields, Daventry, on Tuesday 25 February.
The victim was driving a silver Seat Alhambra when he had to stop to allow the driver of another car to get out of his dark-coloured Ford.
After stopping, the offender then got out of his car and approached the victim, opening his car door before dragging him out of the vehicle and assaulting him. He then left the scene.
The victim was examined by paramedics but did not require hospital treatment following the assault which happened at 5.25pm.
The offender was a white man, aged about 50 with short brown hair and a large build.
Officers would like to speak to anyone who may have witnessed this incident or who may have information regarding it.
Witnesses or anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 555 111.