I voted 6, because that is first grade around here. My daughter just started riding the bus this year, in 4th grade. She is 9, and she walks about .2 of a mile to the bus stop in the morning, and back in the afternoon. I'm not sure if they would let kindergartners off in a situation like this or not. I don't think my 5 year old could handle it by herself, so I wouldn't let her do it, but I think it's fine for my 9 year old.
We live a little over a mile from the school, and I see fairly young children riding their bikes or walking. My daughter had a friend in her class last year who would walk home from school on her own, but I didn't feel comfortable letting mine do that, although sometimes I would go a little late to pick her up, and let her walk part of the way home.
I used to walk 1 mile to school when I was 7, and then a little less than half a mile to the bus stop when I was 8, but the bus would drop us off in front of our house on the way home, for some reason.
In my sister's school's district, the one I grew up in, the bus drivers wouldn't let elementary kids off without an adult there to meet them at the bus stop. They would take them back to the school and call the parent to pick up the child. I remember my mother rushing home to meet my nephew at his bus stop.
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