[patorjk]

It sounds like you did the right thing, you were concerned and kept an eye on things. Calling the police would have been overkill and maybe wrecked this kids' family life (like what happened in the article). Other than that, I see no problem with approaching the kid and saying something like "hey, you can get hurt playing in the street, please take this to your backyard", or something like that. As long as you don't try and start a conversation it's not going to be weird. If you have a kid he may even know who you are already. All of the kids in my neighborhood know me as "Edward's dad", even though I wouldn't be able to pick most of them out of a lineup.