I'd suggest starting with bike paths to schools. Kids don't have the problems you mention, they also don't have an alternative when they want to travel independently.
A lot of Americans are morbidly afraid of their children being away from adult supervision for more than a minute. I think suggesting 10 year olds ride a bike instead of taking a car or bus might infuriate more than a few people.
I remember discussion on reddit where people literally called mom neglectful because she refused to have car.
The issue was that she and 4 years old walked 20minutes to preschool and back. That is it, 40 min total walking time was assumed to be beyond 4 years old capabilities.
Well, it's scary, perhaps because drivers are the most likely people to kill your kid. But all the same I was very fortunate to have parents that let me roam free and explore from a young age.
Not irrationally; there are numerous well-publicized incidents, such as child protective services being called for a six-year old playing unsupervised in their own front yard. Or, and I do forget the state (though I think it was Maryland), a state official saying that children under fourteen should never be left alone unsupervised for any length of time. When I was twelve, I babysat my little sister all day and made us hot lunches. Nothing fancy - just your standard packaged noodles or similar - but yeah, I knew how to use a stove safely.