A few days ago comrade /u/InevitableSwing posted an astounding graph of automobile deaths per capita in different countries.
Obviously America was number one by far 
but what was amazing to me was that Canada's rate is nearly three times lower.
The countries are not that different in many ways 
.
Certainly things like aggressive driving and speed limits of course play a role, but I think the key is probably something a lot more simple: public fucking transit usage.
Example A:
USA
- Own car/drive: 85%
- Public transit: 12%
- Bike: 11%
Example B:
Canada
- Own car/drive: 67%
- Public transit: 23%
- Bike: 11%
So overall 18% fewer Canadians drive, and nearly twice as many take pubic transit.
A lot of our population is centred around the major cities that have decent public transit, and even some of the medium sized cities have decent bus systems too.
- Toronto
- Montreal
- Vancouver
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.