My ds are 10 and 11 go to a school quite far from home. So that means their friends are not local to us. Recently I have been letting them travel to the area. To the local park, to meet up with their friends. It takes about 40 mins by bus. So it means they can't just pop home. If they need to. I give them snacks and a drink to take. And they can refill with water. I don't drive so I can't drop of or pic up. I started letting them because they miss out playing with their friends. They seem to be happy with it. But I'm not sure if its such a good idea. We are in London from zone 3 to 4.