"Gareth Davis" wrote in message
om...
"Ben Nunn" wrote in message
...

Capping needs to be introduced, and it needs to be smart and effective.
The
£90/50 Prepay limit needs to be abolished and the 'nominate a specific
station to pick up your credit' thing must go. Also, a Non-prepay
Pay-as-you-go that bills your credit/debit card would also be far better
than having to add value to the card periodically.

Performing all the calculations required to get the 'instant' capping
to work (based on your last few journies) in the time you have your
card over the reader then to write back the refund to the card while
it is still in range is a non-trivial exercise - and is limited by the
length of the journey record kept on the card. This record needs to
hold every journey over the capping period for the calculation to be
correct.


This seems like poor design to me - surely all the card needs to contain is
a unique ID, and all the other information could be contained within a
centralised database?

BTN