Dave Newt wrote:
Martin Underwood wrote:
Tristán White wrote in message
45:

I took this photo:

http://www.flickr.com/photos/25124954@N00/480556440/
#comment72157600218892777

Can you guess...

(a) where it is
(b) what it's for?

I know the answer to (a), of course, but would love to know the
answer to (b) as it confuses the hell out of me whenever I see it.

As you can see, other people I asked have no idea. So I thought I'd
ask on UTL ;-)

The "Keep Clear" suggests it's the emergency exit from something.


[snip]

Come down the Northern escalator at Warren Street, and right in front of
you are two foot tunnels, one on the left and one on the right. This is
the wall between them.

There may well be a machine room under the floor with all the escalator
machinery. This may be the emergency exit from it. In other words,
keep clear because you're standing on a trap door! (The handles are
there to help someone clamber out).

However, the above is just a guess. Does the floor sound a bit hollow
thereabouts?