A crash shut part of the M25 and left a person trapped in a car.
A “serious” crash between a car and a lorry shut the motorway temporarily between J22 for London Colney and J23.
All lanes have since re-opened with delays of over an hour for commuters. Queues to j21A.
There are also long queues on the A414 between the Park Street roundabout and London Colney roundabout.
Hertfordshire Constabulary are at the scene.
More to follow.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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