On Tue, 2 Feb 2010 23:27:26 -0800 (PST) someone who may be
ticketyboo wrote this:-

Exactly what happens with Oyster: very many rarely used (including
mine) or never again used cards [1]. But, given the very large gap
between Oyster fares and cash fares, the incentive is there to get an
Oyster card when making only one visit to London. There really ought
to be an expiry date on these type of cards in a metropolitan area -
perhaps 3 years.

Why?

As I understand it the £3.00 fine for getting one covers the cost of
the card and provides a buffer against abuse.

Operators tend to have offers for regular passengers,which
discourages irregular travellers. A card which can be used
occasionally and transferred to other people encourages irregular
passengers to use the service, which sounds good to me.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000...#pt3-pb3-l1g54