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Just use a scatterplot. Also, Sydney sprawls.

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Dual-axes at tipping-point Sydney’s congestion at ‘tipping point’ blares the headline and to illustrate, an interactive chart with bars for city population densities, points for commute times and of course, dual-axes. Yuck. OK, I guess it does show that Sydney is one of three cities that are low density, but have comparable average commute times to higher-density cities. But if you’re plotting commute time versus population density…doesn’t a different kind of chart come to mind first? y versus x. C’mon. Let’s explore. First: do we even believe the numbers? Comments on the article point out that the population density for Phoenix was corrected after publication, and question the precise meaning of city area. Hovering over the graphic to obtain the values, then visiting Wikipedia’s city pages, we can create a Google spreadsheet which I hope is publicly-visible at this link.…
Original Post: Just use a scatterplot. Also, Sydney sprawls.