We drive on the left, so why do we walk on the right?

In England, we drive on the left. So it would be natural to walk on the left, right? Wrong! 

This sign, instructing pedestrians to walk on the right, was photographed in the Green Park tube station, in Central London.

In the Green Park tube station

Why? Because of the high concentration of American tourists in Central London? Maybe...but it might just be random. 

I'm conditioned to think that things are the way they are for a reason. It is much harder to accept that most things are the way they are for no especially good reason. It just is what it is. Get with the programme, baby, go with the flow.

Pedestrian tunnel, Green Park tube station