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All roads in the City of London will have a 20mph speed limit by the end of July in an attempt to reduce traffic accidents.

City of London Council said they believe the move will reduce casualties in the square mile, while police said they will “actively enforce” the rule.

The new limit, which comes into force on July 20, will mean drivers will have to abide to a 20mph speed limit on all boundary roads, except Lower and Upper Thames Street.

Transport for London is also setting the limit on two City roads belonging to them. Southwark Council has agreed to set the limit on Southwark Bridge, which means all bridges leading to the City of London will have a 20mph limit.

Cycling campaigners, who first campaigned about the issue in 2011 with a mass protest ride over Blackfriars Bridge, have welcomed the reduced speed limit.

Ashok Sinha, chief executive of the London Cycling Campaign, said: “LCC has consistently argued for lower speed limits in London – a 20 mph limit in the square mile will help save lives. We welcome the City of London and Transport for London’s steps to reduce road danger in the heart of the capital.”

Michael Welbank, speaking on behalf of City of London council, said: “For the City of London to continue its success as an international business hub it is critical that its streets should be safe for all who use them be they commuters, pedestrians, cyclists, drivers, motorcyclists, shoppers or cultural wanderers and dreamers.”

Islington and Camden already have imposed a 20mph limit on all roads, while Southwark, Haringey, Waltham Forest and Greenwich have limits on residential roads.