Police are appealing for witnesses after a driver was assaulted in Maple Road, Kettering, on Saturday, 7 November.
The incident happened just before 3pm, at the junction with Laburnum Crescent.
The victim was driving down Maple Road and stopped at the junction with Laburnum Road. A dark-coloured van, believed to be a Mercedes and with a foreign registration plate, was travelling in the other direction.
The van stopped and a man got out of the passenger side, went up to the victim s car and punched the driver in the face.
The offender, a white man, got back into the van, which then drove away and turned into Stamford Road.
Witnesses, or anyone with information, are asked to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.