The pre-school my youngest has this. The middle school my oldest goes to is much more relaxed. I'm fine with treating my 4 year old like she can't be trusted to run around alone, but my 11 year old can.

What I'm not fine with is there is no bus service for the 4 year old, we have to drive her (I bike, but it isn't a great route - we have to cross a busy 4 lane)