We live in a very pretty Touristy village. It's very close to a major duel-carriage A road, i.e. from our front door we can see the road which leads onto the slip road to the A road. The A Road frequently is closed due to traffic accidents and then motorists use our village as a cut through. The village is long and straight so at other times, motorists shoot through at 40mph.
None of this has been a problem and we have lived here several years. However, over the past month or so some kids have been playing out on the street unsupervised. They look about 7 and 11. They play on scooters and zoom up and down the road, basically they hang outside the village pub and then outside our door. I think their dad goes to the pub and lets them play unsupervised outside.
Things have escalated and my DChild (aged 10) wants to join them. I said No, but DH over-ruled me last night and let our DC out to play with them. Fortunately it started to rain so I opened the front door to call my DC inside, only to see the Dad with the kids about to cross the road. I don't know who he is, I presume he's the Dad as I've seen him with them a couple of times. He stays at the pub late and I hear them walking home at midnight.
I think this is too dangerous on every level. I've tried to put most of this in the OP so that I don't drop feed later.
I think that it would be irresponsible of me to let DC out onto a busy road with people we don't know who have a more relaxed view of child rearing than me. There. I've said it.
As for inviting them in, I wouldn't mind if it was for an hour. But last week the kids were banging on the door of the kids who live next door and all of them ran riot until 12.30am.