In message , Roland Perry
writes]

In message , at 10:25:59 on Sun,
27 Feb 2011, Paul Terry remarked:

Pay wave can only be used for a purchase of up to £15 (only recently
increased from £10), so it's not really suitable for purchasing
multiple tickets.

I wonder if the same restrictions would apply to this ticketing
scenario? I get the impression it's a brand new scheme with potentially
brand new rules.

The limit is there because of the insecurity of contactless bank cards.
Lose the card and anyone can use it, typically for five transactions
before being asked to present a PIN (There's no real-time processing of
contactless payments, so even when a lost card is reported, it can't be
stopped immediately like a chip-and-pin card).

If that happens, the banks generally pick up the tab, so they would be
very loathe to increase their exposure to risk by upping the limit
(especially since TfL have already negotiated that a PIN will never be
requested at busy stations).
--
Paul Terry