Ever since London Underground installed escalators at Earls Court Station in 1911, customers have been requested to stand on the right and walk on the left. It is now one of the unbreakable rules of the Tube.

All that changed, however, when Transport for London ran a three week test at Holborn station in November 2015. It asked people to stand on both sides of one of the escalators in order to ease crowds.

As TfL claimed the test cut congestion by a third, a six month pilot has now under way.

Does standing on both sides of the escalator work? Test it with our interactive simulator

The interactive below shows how the trial helped ease congestion - showing the number of people reaching the top of each escalator, and based on figures provided by TfL.