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I wonder if it would make more sense to tell people "please consider walking up the left side of the escalator instead of standing". It would probably improve congestion, but even if it didn't, people might get a little bit more exercise out of their commute.

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That is the normal recommendation on the London Underground and that is what they are specifically not doing in this case as an experiment.

http://citytransport.info/Digi/P1240646a.jpg

No, that means "if you choose to walk, walk on the left". I mean "Walk, and do it on the left."

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