Paul Corfield wrote:

I very, very much doubt it but I don't know exactly how the gates are
programmed to deal with this in validation terms. The example quoted
involves a Travelcard that is valid at both ends and where there is also
an entirely reasonable direct service that avoids Zone 1. I cannot see
how in that example that TfL could impose a deduction from the PAYG
element on an Oyster card when the passenger holds a valid Z26
travelcard. Clearly there is a "risk" here but it is no different to
prior to Oyster where there were three fares between Stratford or
Highbury to Richmond

It's the same risk as for PAYG users, is it not? (Think ahead to when
PAYG will be valid on the NLL.) So why are Travelcard users presumed to
be avoiding Z1 while PAYG users are presumed to be going through Z1 for
the exact same trip? (Or am I misunderstanding?)

This applies for journeys undertaken entirely on PAYG.

I didn't realize that.

Does that mean that, if I'm using an Oyster-based Travelcard, I won't be
charged extra as long as the entry and exit points are in my card's
valid zones? Or does the system recognize when there is no possible way
to get from entry to exit without passing through Z1 and charge extra
accordingly?
--
David of Broadway
New York, NY, USA