We live in a terrace of 7 houses on a main road. The road has mixed housing - some detached and semi-detached, and another terrace of similar length. The opposite side of the road is double-yellow lined and indeed, some of our side is too, though not outside our terrace. When there were three of us with cars living here we had a rule within our family that if one of us was parked on the terrace, the other two would park elsewhere, even if there were spaces free on the terrace. We just felt it was being considerate to others living on the terrace who also needed to park. Most other residents had a similar respectful approach.
However, time has passed, and houses change hands. Our next door neighbours have two private cars and two works vehicles and, when their daughter visits over Christmas there is her car as well. I've known all five vehicles to be parked on the terrace at the same time. Not acceptable IMO, very selfish. Thing is, in all other respects they are a lovely family, really kind and generous and we get on very well with them, so I would never dream of mentioning the parking thing. It is really too trivial in the great big scheme of things, but annoying just the same, especially when you get home from the shops with 3 or 4 heavy bags and you have to park around the corner and drag them home, often in the rain