Herts Police have confirmed why the A1(M) and surrounding areas had gridlock traffic after the motorway was shut last night (December 3).

Vehicles were queuing for hours along the northbound carriageway and being diverted after officers shut the Hatfield tunnel near junction 3 shortly after 7pm.

At around 9.15pm, BCH Road Policing Unit posted on X: “The Hatfield tunnel remains closed whilst officers deal with an incident on the northbound carriageway.

“We are turning vehicles around so that we can get everyone safely off of the motorway but this will take some time so please bear with us.”

This morning, a Herts Police spokesperson said: “Police were called at around 6.51pm yesterday (Sunday) to report a concern for welfare of a man in his thirties near to the A1(M) in Hatfield.

“The man was taken to hospital with non-life-threatening injuries.

“The road was closed while emergency services attended the scene, and it was reopened by Highways at 10.52pm.”