Cartograms plus zoomable web maps tend to be fail city. And, on top of that, cartograms tend to be rather unreadable. For the critique, http://www.cartogrammar.

Cartograms plus zoomable web maps tend to be fail city. And, on top of that, cartograms tend to be rather unreadable. For the critique, http://www.cartogrammar.com/blog/i-hate-your-favorite-election-map/ http://www.cartogrammar.com/blog/i-hate-your-favorite-electi... That said, it's always useful to have data be relative to population rather than absolute, if it is a relative number. I don't think that's valid in this case, because these aren't accidents 'of the population' - they're accidents of people traveling on roads, which is entirely different. If the coloring were relative to traffic density or throughput, that'd be better.