Green councillor Scott Ainslie, has been in direct contact with senior Transport for London managers to alert them to the need for traffic to diverted to avoid the gridlock in the centre of Streatham, which may continue for two weeks as Thames Water dig down to repair a sewer 5 metres below the road.
On Saturday surrounding streets were in chaos as heavy traffic tried to find alternative routes to the A23.
Traffic disruption will continue into February and March as TfL plan to begin work on a re-design of nearby St Leonard's junction.
For decades the junction has been a major hazard for local people - with , 22 collisions, incuding two tragic fatalities in just the last four years.
Collisions increase on A23 through Streatham
Sister pays tribute to brother killed on A23
A death or serious injury every six weeks
Streatham's message to Sadiq on road deaths
'Deadly complacency over Streatham road deaths'