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Originally Posted by Aroundtheworld
Ok, fair point. Well here is some real data from Translink and it shows that per capita has been decreasing especially in the last few years.

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Per capita can be a misleading stat in this regard. For example, if the per capita consumption of something stays the same, but the population increases, then the total consumption is increasing. If I had a business and I increased my prices, and my per customer spending had increased $10 this year, that stat would be completely pointless outside of context: it's horrible if my customer base dropped 90% as a result of the higher prices.
So the question is, does the decrease in the per capita vehicle miles traveled exceed the increase in the population? Metro's population has grown by more than 16% over that time, but that chart shows about a 7% decline per capita in use. That means there is probably a net increase of total vehicle miles traveled.
It is a good statistic. It shows that transit does have an impact. But it doesn't show the problem has been solved, nor necessarily indicate that the trend would continue to zero if ran to infinity.