Motorists are facing delays on the M1 following a serious crash near Redbourn.
Emergency services were called to an accident northbound near Junction 9 at around 8.20am and traffic was held as the vehicles were moved to the hard shoulder.
All lanes have now reopened but there are still tailbacks.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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