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Apparently when riding the underground people look up at the map and check their progress on average every 40 seconds. Most of these people know exactly where they are going and when they will get there, so why do they do it? I suspect the answer has a lot to do with the need to track advancement and ensure that they are indeed reaching their destination, which is a bit strange considering they are on a rail and the likelihood of them not getting there is pretty much zero.
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