The M1 main carriageway has reopened following a "serious" crash involving a motorcyclist.
The crash happened on the southbound slip road at j8 near Hemel Hempstead.
Drivers cannot join the M1 at j8 in either direction.
Drivers travelling southbound cannot leave the M1 at j8 but drivers travelling northbound can leave at j8.
Emergency services were called at around 2.30pm and an air ambulance was called to the scene.
There are long delays in and around Hemel Hempstead.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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