Police are appealing for witnesses and information following an altercation in London Colney.
The incident occurred between 4.50am and 5.10am on Sunday 10 September, at the Bell Lane roundabout.
It is reported that a black Volkswagen Polo and a second vehicle – described as either a black Ford Focus or Vauxhall Astra – were in collision.
The driver of the second vehicle then reportedly exited and began hitting the Volkswagen.
The driver of the Volkswagen sustained facial injuries as a result of broken glass.
PC Rochelle Staddon, who is investigating, said: “Our enquiries are continuing, and I am urging anyone with information to please get in touch.
“Did you see what happened? Alternatively, if you were driving in the area at the time and have a dash cam fitted, please check it as you may have recorded some crucial footage to assist our investigation.”