In message , at
10:26:00 on Mon, 31 Oct 2005, Colin Rosenstiel
remarked:
TBH, not being an Oyster user I hadn't even noticed. My attention has
always been on the bit relevant to me. As has been explained to you,
the red light doesn't mean go, it means the Oyster reader is not
ready to read Oyster cards.

That may be the technical explanation (and it came up in here years
ago when the Oyster attachments were first installed), but for a
normal person who is simply using the gates, they get a consistent
indication that "red means ticket is OK".

Normal people not using Oyster need to look elsewhere for the
information they need.

The obvious place being the gates ahead of you - which open if the
ticket's OK. However, the lights are right next to the slot you put the
ticket into, and so are hard to miss.
--
Roland Perry