On Sun, 14 Dec 2008 18:19:17 +0000 someone who may be Paul Corfield
wrote this:-

For rail
applications in the UK I am not aware of any standard width gate that
works on the basis of "first come, first served" in that it can be entry
or exit depending on which ticket transport / card reader is activated
first.

A long time ago someone thought swing doors which automatically
opened away from people would be a good idea, in a large computer
centre somewhere in Scotland. They were fairly big doors and the
idea was that working this way would speed things up for people
pushing trolleys. The idea was simple enough in theory and it worked
when tested. However, the testing was not thorough enough. Within a
few days of the inmates being introduced to the building the first
instances of what was missing in design and testing occurred. Two
people would walk up to the doors and the one who got there
fractionally first would find the doors opening away from them, the
person who got to the doors second would find a door swinging
towards them (and their trolley sometimes) at a fair speed. Some
people were felled by the doors, fortunately without serious
injuries.




--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54