Not denying that, but even if you correct for that, the number of traffic deaths is still way off for the USA. There is probably something about how, what, where or when Amerikans drive that factors heavily into the number of traffic deaths. And it's not just how pervasive car brain makes automobile usage, in the original graph you'll see that an absurdly carbrained country like Germany has even lower numbers than Canada for annual deaths.

In the case of Germany, i can say that this hasn't always been the case and that traffic planning plays at least some part in that. City planners here actually take a look at places where accidents happen a lot and try to find out what's going on there and how to fix it. That can mean a change in confusing or lacking road signage, removing obstacles that block sight of intersections, repairing dangerous road conditions, installing roundabouts or traffic lights or enforcing speed limits with fixed radar traps.

Another major factor could be how safety precautions are treated. It's an incredibly Amerikan thing to use these things that bypass seatbelt warners. Seatbelts have massively reduced the number of traffic deaths when they became mandatory.

Then there's the issue of Amerikans driving "cars" that have worse pedestrian visibility than a literal tank, crush everything they touch into a fine red mist, and are also prone to flip over when they swerve off the road.

Also, Amerikan infrastructure makes accidents between cars and cyclists or pedestrians incredibly likely.