And a link to the nicely titled study[1]:<p>"Is the curb 80% full or 20% empty? Assessing the impacts of San Francisco's parking pricing experiment"<p>[1] <a href="http://people.ucsc.edu/~adammb/publications/Millard-Ball_Weinberger_Hampshire_2014_Assessing_the_impacts_SFPark.pdf" rel="nofollow">http://people.ucsc.edu/~adammb/publications/Millard-Ball_Wei...</a>