For those who grew up in a time and place where you were able to wander without supervision, how far away were your friends? Follow up, how much traveling did you do on your own?
For me growing up in 2000's suburbia, the closest kids around my age that I knew of were about one mile and major road crossing away, but to get to a friend it could be a lot more. I think kids out in a group doesn't feel like a safety concern to most people even now, but if they have to travel 5+ miles solo just to meet up with one other person, that's where the issue might lie.
Born in 1990. In the 1990s and the first half of the 2000s, many of my friends lived in the same neighborhood. That's how we became friends in the first place: you'd see each other outside and gradually become friends.
By the time I was 14 or so, many of them had moved to other parts of the town, typically 2-3 miles away. By this age I was comfortable riding a bike or walking to visit them, though equally as often we'd ask our parents for a ride just to save ourselves time or because we were bringing heavier stuff with us.
I did have a few friends that were farther away, about 4+ miles, and I rarely if ever made it out that far on bike or foot. That was a mix of the distance and the type of roads I'd have to take or cross to get there.
Growing up in the 70s and 80s, my friends were within a 2 block radius, so about 300 yards. Tack on another block each year and that was the standard walking distance to a friend's house.
And of course in high school there was the standard minimum of one student death per year per school, usually related to driving. So teen deaths seemed more prevalent than younger ages.
I used to live a kilometer away from school and would walk/ride there myself from 9 or so years.
Then when I was ~12 we moved further away. Probably 3-4 kilometers and I would still ride in.
I had friends scattered all over the area between my place and school but I never needed any assistance from them.
Same block, next block, and 3 miles (5 km).
I had some friends within half a mile or we'd meet at a park. But in high school, my friends were a few miles away and across a few highways. We needed to drive. Idk if this counts but my parents did let my older brother with a license take me places in his car.