As the sender of the photo pointed out, it’s a very odd thing to require that one carry a dog in order to be allowed to use the escalator, especially given restrictions on bringing dogs into the UK. A passport surely must be carried. But a dog?
But of course, what it really means is “those who have a dog with them must carry their dogs rather than letting the dog walk up the escalator.” But that’s rather a lot of words for a normative sign, isn’t it?
Brevity may be the soul of wit, but it’s also the source of a lot of ambiguity.
Thanks to Wayne Norman for sending the photo.