Cyclists will be permitted to ride the wrong way up one-way streets to encourage more people to give up their cars.
Kensington and Chelsea council is testing two-way access for cyclists on several residential roads with the scheme set to be extended across the borough if there is no increase in collisions.
New signs will advise cyclists where they are allowed to cut through and avoid the long circulatory one-way routes motor vehicles must take.
Road surfaces will not be changed and there will be no dividing line between cyclists and oncoming vehicles - instead they will be left to navigate their own paths.
Cycling up a one-way street will soon be legal in Chelsea.