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[quote user="MidlandMike"] Sam, from what you say, it seems that both DART and you take actual miles ridden by the people into account.  Nevertheless, there may be a logical reason for person-miles not increasing as fast at system milage.  Let's say for simplicity the line started with a 1 mile section, and 1000 people rode it, which would produce 1000 people miles.  If the line was expanded to 2 miles, and you still had the 1000 people riding the original mile, plus another 1000 people riding the entire 2 miles to downtown, that would equal 3000 people miles, or a 1.5 mile average trip.  So while the system milage doubled, and the number of riders doubled, the average trip went up only one and a half times.  In a center city oriented commuter system, the outer milage will naturally be less utilized. [/quote] You are correct.  Expansion of the DART light rail system since 2005 has been extensive.  And it the miles have grown at a faster rate than the rate of growth of the user population, thereby reducing the utilization of the outlying mileage.
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