Annual vehicle miles traveled per capita, by state

[Brittain33]

http://www.theatlanticcities.com/commute/2013/08/americas-driving-less-and-evidence-suggests-it-cant-be-just-about-economy/6706/

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It is miles per resident.  So people driving across Wyoming add to the numerator but not the denominator.  You can see similar effects in Oklahoma, New Mexico, Indiana, Missouri, Vermont, and Alabama where people from more numerous states drive across or to them on vacation.

But would we expect increases in vacation traffic by road between 2005 and 2011 that would have a measurable impact and push numbers higher?