Leading councillors in Richmond are determined to push ahead with a borough-wide 20mph speed limit - following similar success from neighbouring borough Wandsworth.
Cllr Alexander Ehmann, deputy leader and cabinet member for transport, said the research “strengthens” Richmond Council’s view.
In Wandsworth, residential roads have had 20mph limits since June 2017.
Despite a 9% fall in the total accidents on those roads, there have been 19% less accidents involving pedestrians, bicycles and motorbikes.
Collisions between pedestrians and vehicles are three times less likely to be fatal if the speed of the impact is 20mph compared to 30mph.
Councillors in Wandsworth are now considering extending the scheme to some of the borough’s main roads as well, after further traffic studies and another public consultation.
In Richmond, the council is proposing a much wider area to be covered by the limit, with all but three of the council-maintained roads included.
Cllr Ehmann said: “If there is a negative from this research, it’s that the Wandsworth taxpayers will be paying more than the Richmond residents will.
“I think there is a strong imperative for bolder action, as shown by the data from Wandsworth.
Richmond Council recently released the results of its consultation on the issue of 20mph, with 10,000 residents being split 49.7% against to 47.9% in favour.
It will be discussed at the Housing, Community Safety and Environment Overview and Scrutiny Committee on 25 February.