Scott wrote:
But if people walk will they not spend less time on the escalator,
leaving more capacity for others? A 70mph road must be able to carry
more traffic each hour than a 30mph road.


OTOH the escalators I observe have, even during peak periods, more and
bigger gaps on the left than on the right. As with roads, not everyone
walks even if there is space to do so; and then not all at the same
speed. And unlike roads with 70 mph speed limits, the left side of
escalators doesn't leave scope for overtaking. Unless escalator
leapfrog is the next leap forwards


--
Robin
reply to address is (meant to be) valid