"Paul Corfield" wrote in message
...

With a validator equipped station Travelcard holders
who are "in zone" don't have to swipe their Oyster
card but if you are out of zone you do for the
purposes of calculation of auto ticket extensions.

I see no way that LU can prevent fraud. You can travel anywhere you like on
the system with a one-zone travelcard, and then when you get to your
destination, if the gates are active, you swipe and have your extension
deducted... if the gates are inactive, you just walk out and you have no way
of getting caught. If any RCI stops you en route out of your travelcard
zone, you just say you are going to swipe for the extension at your
journey's end.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes