Two people were taken to hospital yesterday following a crash on a road which connects Welwyn Garden City and Hatfield with St Albans.
Police closed Coopers Green Lane following a collision involved a grey BMW and a white Golf at around 4.40pm near the Hatfield Business Park turning.
A spokeswoman for the ambulance service said: "We were called to Cooper's Green Lane shortly before 4.40pm yesterday to reports of a collision.
"We sent an ambulance and ambulance officer who treated two patients at the scene before transporting them to Lister Hospital for further assessment and care."
Officers said a witness had left the scene prior to their arrival, and that anyone with information should call Herts police on 101.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here