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Could you give some examples?

In Zone 1, the stops are so frequent that the number of stops is normally far more significant than the distance between them; and in the outer zones, you rarely have a choice anyway.

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Mostly it has to do with where things are in reality on the surface rather than taking wrong routes. You can look at a map of London and try to correlate the stations on that map with the "official" non-geographical version, or you can have a map of London and a map of the tube system that's fairly close to it. Just going off the Thames alone makes it easier to figure out where the best place to get off is.

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