One blogger makes the case for walkable urbanism, in the context of the social and physical well-being of adolescents specifically.
"The subdivision I grew up in had a couple other kids that were in my age range. I was lucky. Outside of the subdivision, there was nothing else in walking distance. The roads to get there had no shoulder, either. As much as I liked the other guys in the subdivision, they weren't my best friends. If I wanted to see friends from school, my parents had to drive. Once again, I was lucky that my parents had time for frequent trips to friends' houses, as long as I gave them ample notice and they talked to my friends' parents. However, that's a lot of big "ifs." It's silly that a parent must devote time, energy, and money from gasoline, insurance and car depreciation every time two kids want to play video games or kick a soccer ball together.
A pick-up soccer, football, or basketball game was even more complicated. We couldn't just go down to the local field and play with whatever kids were hanging around looking for a game. Instead, we had to call guys who lived in distant subdivisions and talk to their parents about car transportation. If anyone's parents weren't around, or were too busy to take an hour out of their day to drive their child to a pick-up football game, we couldn't play. Since organizing required effort, we'd only call our friends. This deprived us and other adolescents of a major social lesson: getting along with people other than your friends."
FULL STORY: It takes a village: why walkable urbanism is good for adolescents

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