They do, they get very slick in some conditions. In winter/freezing conditions it's an outright hazard. But there really aren't that many such streets left, and the few that are are slowly being changed to asphalt too.

Can confirm, having worked food delivery in the Netherlands.

There's a really good reason they're only used on low speed streets and squares, and now large roads.

You are right. They are. But they're less common than driveways in the US and I don't know why you guys make yours so smooth that if there's freezing weather you can't even walk up it if there's the tiniest incline.

Not that this is any sort of competition, just thought about it