Mizter T wrote:

No standard gates that I've ever come across are bi-directional at the
same time - that would cause a total nightmare with people walking
head-first into each other all the time! Instead gates can simply be
switched from one direction to the other as required by traffic flow.

Well lets hope the staff at Waterloo are more savy than those at Liverpool
Street. The high number platforms' gateline is frequently set too heavily in
the wrong direction for the peak flow, and has in and outs scattered across.