In article ,
Tom Anderson writes
Zonal systems are still intended to make the cost of a journey be based
on the distance you travel. For a network of radial lines, concentric
zones work quite well, but an orbital line like the NLL breaks that
model. Hence the change to the boundaries.

I'd wondered if that was the case, but it just seemed too silly. Surely
the whole *point* of orbital lines is to encourage journeys like that;

No: orbital lines are built for various reasons (and that particular one
is a hodge-podge). As it is, you get a fair discount for the orbital
journey (a Z23 fare instead of a Z1-3 one).

Places with significant numbers of orbital lines use a "tiled" system of
zones rather than concentric ones. Look at Copenhagen or Tyne & Wear.

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Clive D.W. Feather | Home:
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