The westbound carriageway of the A505 is closed between Baldock and Letchworth after a crash this morning.
The carriageway from the B656 Royston Road to the London Road roundabout is closed - causing severe delays on Royston Road heading into Baldock.
The crash took place around 11.15am.
Motorists are advised to avoid the area.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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