On Thu, 26 Nov 2009 13:16:08 -0800 (PST), MIG
wrote:

But it's that assumption of guilt again, that you don't get with a
paper travelcard, ie you are assumed to have gone beyond your zones
unless you can prove that you didn't.

That's the basis for most such smartcard schemes - charge the maximum
possible on entry, refund back on exit.

What it means is that anyone in the system (provided they don't go
past the boundary of its validity) always has a valid ticket provided
they've touched in.

Neil

--
Neil Williams
Put my first name before the at to reply.

On 26 Nov, 22:31, (Neil Williams)
wrote:
On Thu, 26 Nov 2009 13:16:08 -0800 (PST), MIG

wrote:
But it's that assumption of guilt again, that you don't get with a
paper travelcard, ie you are assumed to have gone beyond your zones
unless you can prove that you didn't.

That's the basis for most such smartcard schemes - charge the maximum
possible on entry, refund back on exit.

What it means is that anyone in the system (provided they don't go
past the boundary of its validity) always has a valid ticket provided
they've touched in.

But someone with a travelcard has paid everything up front, for a
week, month or year, and they don't get charged anything when they
touch in or out. This would have to be about PFing them for breaking
a rule, despite not having avoided any fare, despite being
demonstrably in possession of a valid ticket, purely on the assumption
that they can't prove they aren't about to head for Thurso, just as
someone with a paper travelcard can't.