Dave Plumb wrote:

Do you touch on the pads at Finsbury Park on the way in or out? I
would have
thought if the system saw you coming in at, say, Holborn and not
coming out,
that it could charge you an extension on the basis that you might
have gone
all the way to Cockfosters and the barriers were open (i.e. it would
leave
the journey open). But had that happened, you wouldn't have been able
to
re-enter anyhow.


If you touch in within your travelcard zones but don't touch out it
assumes you are honest and charges nowt. If you touch in outside your
travelcard zones and don't touch out it assumes you aren't.

I beleive this has been discussed before - have a look at the archives.
Chris