Changes are currently being made to the junction of the Mall with Horseguards Road as part of the Central London Grid of cycle routes.
Until now, there has simply been a bollard in the middle of the junction and a pair of pedestrian crossings of the Mall some distance from the junction in each direction.
Traffic signals are now being installed at the junction. These will incorporate pedestrian phases, so that the existing crossings can be removed.
Until now, turning right out of Horse Guards into the Mall has been difficult - for cars as well as bikes - especially when there is a queue of traffic waiting to turn right from the Mall. And there has been no pedestrian crossing of Horse Guards Road.
The bollard is the famous one around which David Cameron was filmed by the Daily Mirror cycling the wrong way in 2008, before he became Prime Minister. BBC News report
The junction is on the line of a proposed Quietway between Fitzrovia and Pimlico. It is also the start of a link to the East-West Cycle Superhighway at Buckingham Palace.
The work is expected to be completed in March.