The M25 is struggling with the weight of seasonal traffic with drivers told to expect delays of around an hour this afternoon.
The Highways Agency has reported very heavy congestion anticlockwise from Junction 19 Watford down to Junction 11 in Chertsey, Surrey.
The agency said no accidents have been reported on the motorway in that stretch.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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