The incident occurred at around 11.10am on Wednesday 9 August, on Coopers Green Lane.
It is reported that a verbal altercation occurred between the driver of a white lorry and a green Mini Cooper.
PC Peter Coy, from the Welwyn Hatfield Intervention Team, said: “Our enquiries are continuing, and we are urging anyone with information to please come forward.
“Did you see what happened? Additionally, if you have a dash cam fitted and were driving in the area at the time, please check it as you may have recorded some crucial footage to progress our investigation.”
Anyone with information is asked to please email PC Coy.