We're actually famously good at not killing each other with cars. I think some of the Scandihoovian nations may have better road safety than us, but that's about it.

In fact, we're pretty good at not killing each other, full stop. London (in particular; other large cities like Birmingham and Manchester are also included) does have a knife problem, though. But, as we've seen in the US, we can handwave away young black people killing each other as "just gang trouble".