There are severe delays at a busy interchange following an earlier accident. 

The A406 North Circular eastbound is heavily congested after the incident at the Crooked Billet roundabout in Walthamstow.

Drivers are being advised to avoid surrounding roads, including Wadham Road and Billet Road. 

There are long tailbacks on the A406, all the way to the A10 Great Cambridge interchange in Enfield.  

All lanes have now been re-opened. 

Traffic in the opposite direction on the A406 Southend Road is queueing westbound up to Waterworks roundabout after cars slow down near the accident.