I wonder how much urbanisation plays into this. If your city is designed entirely around cars there's far less opportunity for kids to go out themselves. I've

I wonder how much urbanisation plays into this. If your city is designed entirely around cars there's far less opportunity for kids to go out themselves. I've always lived in a walkable places (ie in the UK) and growing up was told to walk everywhere. From a young age (maybe 8?) I could walk faster than my mum so she let me power off on my own to school. Naturally I became very independent. But if there are no sidewalks, if your town is car centric and drivers have no regard for pedestrians? How in those places do you create opportunities for independence?