They're not thin enough. A suitcase will fit through sideways
Saw exactly that happen passing through this morning.
Two travellers each with two hard cases went through with them sideways and got all the way to the escalator before being admonished by a staff member!
The barriers have reflective signs attached with various things you mustn't take on the escalator crossed out.
Unfortunately they have installed a half barrier (ie. half the width) right in the middle of the row, ruining the symmetry. They could have put it at the edge with a little more thought and measuring.
All the various vinyls, posts, barriers, "shaming cameras" that have been installed do rather ruin the architecture.
Not saying that trumps safety, but white vinyls everywhere do look rather cheap and haphazard. If they're going to do it then they could do a better job.
The barriers at the top have now been installed.
A number of the bolts holding them down are loose/misaligned.