Traffic information company Inrix said the accident led to delays on the M11, the A12 and the A406 North Circular.
The worst of the hold-ups were on the M11 and drivers were being advised to leave an hour extra for their journeys.
More top news
All inspirational people who have shown courage and kindness in the most difficult of circumstances.
Omid Saidy, 20, was attacked outside Parsons Green Tube station in west London on Monday evening.
Selfridges is unveiling its Christmas window displays in the hope of getting shoppers into the festive spirit.