Here's a snapshot of what things are like in Berlin, Germany.
I dropped my 7 year old off at a new day camp (in the centre of the city) last week. They asked me if she was allowed to leave on her own at the end of the day.
Here are the rules for kids riding on the subway system:
"Children under four years of age may only use public transport if they are accompanied by a person who is at least six years of age."
That said, you don't see a lot of little kids travelling alone but it seems that the discretion is with the parents.
I dropped my 7 year old off at a new day camp (in the centre of the city) last week. They asked me if she was allowed to leave on her own at the end of the day.
Here are the rules for kids riding on the subway system:
"Children under four years of age may only use public transport if they are accompanied by a person who is at least six years of age."
That said, you don't see a lot of little kids travelling alone but it seems that the discretion is with the parents.