New speed limits which could "save hundreds of lives" are set to be introduced this year.
Road safety campaigners claimed the new motoring laws can mean less accidents occur on the streets.
Gary Digva, spokesperson for Road Angel, backed London mayor Sadiq Khan's new driving law.
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It is believed eight London boroughs could be impacted by the new speed limits.
Transport for London (TfL) confirmed 65km of roads would be converted into new 20mph restrictions.
No firm date has been given for the new changes but officials claimed it will launch in 2023.
Gary said: "The introduction of more 20mph roads will help to reduce road accidents and fatalities in the capital.
"Road safety should be the top priority with the high rate of deaths and serious injuries on Britain's roads.
"Spain saw a 20% mortality rate decrease after implementing the lower speed policies, so there is substantial evidence that this will work to make our roads safer, and potentially save hundreds of lives a year.
"Lowering the speed limit in areas where there are a lot of vulnerable road users, such as cyclists and pedestrians, makes sense as it reduces the risk of fatalities should there be a collision.
"Not only does lowering the speed limit reduce the force and impact of a vehicle, but it also dictates if a driver is able to stop in time to avoid a crash."
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The new measures will impact areas like Greenwich and the Royal Borough of Kensington and Chelsea.
Meanwhile Lambeth, Lewisham, Southwark and Wandsworth will also be hit with the new restrictions.
Merton and Bromley are also on TfL's list despite being located on the capital's outer edges.
TfL said: "We're lowering speed limits because if you hit someone at 30mph they're five times more likely to die than if you hit them at 20mph.
"The work is part of the Mayor's Vision Zero policy which aims to see no one killed or seriously injured on our roads by 2041.
"Safer speeds made a large portion of London safer for people to live, work and commute, encouraging more Londoners out of their cars to walk, cycle and use public transport.
"More people using healthier and more sustainable forms of travel is vital to reducing congestion and air pollution."
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