[witheredspirit]

Have you verified your numbers? With some basic searching I found that the amount of cars registered in the EU seems to be comparable (if not slightly more than) than the USA, while the total length of public roads in the USA is about 10% more than that one of the EU. Keep in mind that in the EU you have a lot of European routes which can stretch vast amount of distances over several countries, similar to the US' interstate system. The biggest factor I can think of is the lack of sidewalks and bike lanes in the US on many roads, additionally there's a disregard of bicyclists by car users, which negatively encourages these two to be as prevalent on the roads as compared to in the EU, since everyone is incentivized to just get a car anyway.

[firesteelrain]

You might want to double check your own numbers. EU having “comparable or slightly more” cars than the US depends entirely on whether you count the EU as a single bloc or as individual nations. Per capita car ownership is still higher in the US. Road length is also not the relevant metric. What matters is road design, lane width, speed environment, lighting, and pedestrian exposure.

Pointing to “a lot of European routes” does not explain why US pedestrian deaths climbed 80 percent in 15 years while EU rates fell. Road geometry, car size, and enforcement patterns do. Sidewalks and bike lanes are part of the story but not the whole story.

If we are trading verification requests, the burden applies both ways.