A12 closure causes heavy traffic in east London
The Blackwall Tunnel southbound approach closed on Wednesday morning due to the road surface breaking up.
Emergency repairs were being carried out to the A12 to Blackwall Tunnel Northern Approach, although it is still possible to access the crossing from the A13.
By 7.30am traffic had built up on the A12 as far as the George Green Tunnel in Wanstead. There is a road diversion in place.
TfL is urging people to use other routes and those with bus tickets can use alternatives on the Underground.
The closure is at the southbound junction of Devas Street, The Bow Interchange and Lochnagar Street.
Queues were also seen on the A13. There is also traffic northbound towards the Blackwall Tunnel from the Sun In The Sands Roundabout.