One of the many differences between Canada and the US is that our roads are less deadly. A new study by the US Insurance Institute of Highway Safety and the Canadian Traffic Injury Research Foundation found that between 2010 and 2020, total road deaths in the US rose 18%, while in Canada they declined 22%.

This "crash gap" also widens when you look at deaths per vehicle mile driven (as opposed to per capita), which should, in theory, normalize the fact that Americans tend to drive more on average than Canadians. So why might this be? Both countries are broadly car-oriented, at least compared to the rest of the world.

The study presents a number of possible explanations: Canada has stricter drunk driving laws, Canada uses more traffic cameras, Canadians are relatively poorer and therefore drive less, Canada has higher gas taxes (which discourage driving), and the list goes.

But my unproven theory is that a lot of this gap can be explained by differences in the built environment. Solutions like traffic cameras are, to give just one example, what you do when you've failed to design the road you actually want. They're patches, not fixes.

The root problem is the design of the road itself, which is why New Yorkers are only about a third as likely to die from a transportation-related accident compared to the average American. Why? Because it's an urban place designed around non-car mobility.

Conversely, this is also why the top 20 most deadly metro areas in the US for pedestrians are in the south, as opposed to in older northern cities. And it's because these tend to be newer car-oriented metros.

So when it comes to Canada vs. the US, I suspect that much of the gap can be explained by differences in the physical environment and higher transit usage north of the border. It probably also explains why Canada is safer than the US, but not safer than Europe when it comes to transportation-related fatalities. We're simply not urban enough.

The simple takeaway is that the more you optimize your environment for cars, the more dangerous you make it for humans.

That said, this is likely to change with the continued adoption of autonomous vehicles. We can (and should) debate whether it's prudent to plan our cities around them, but I think there's little doubt that we'll see road safety increase dramatically.

Chart via CityLab