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✓ chart shows data from all relevant years, not suspiciously selected years ✓ chart depicts measures that are constant over time (deaths, miles), not indices of a sample population that is in constant flux ✓ chart does not rely on counter-intuitive math ✓ y-axis is zero-based The apparently very good trend shown by the red line is a bit misleading, as the blue line shows rapid growth in number of miles traveled, so we should multiply the two lines together to get the total number of deaths. (It's not much consolation to know that someone drove a lot of miles before being killed in a crash.) We would also want to correct for population change. Wikipedia has the result: