The 20mph limits could be extended on other red routes in the capital, Transport for London says
Speed limits of 20 mph (32kph) are to be introduced for some of the busiest roads in central London.
The plan to lower the maximum speed limit on some red routes is part of a pilot to help save lives and improve road safety, Transport for London said.
Eight areas will trial the lower speeds from April, starting with Commercial Street in Tower Hamlets.
The London boroughs of Islington, Camden and City of London already have 20mph speed limits on borough roads.
About 25% of the roads in London currently have 20mph restrictions. The new speed limit routes announced apply to the red routes owned and managed by Transport for London (TfL).
London Mayor Boris Johnson said: "Lower speeds have the potential to significantly improve road safety while enhancing the environment for walking and cycling."
