I think the book on my car says to check the nuts again after driving it and it has 18in alloys, I find that when doing them up that the amount that the nut turns is bugger all, till she dead solid stops turning.
All the other alloy wheels I have had do not lock up as directly as this one does, I like the old bull nosed type bolt ends that come with steel wheels the best for the feel they give, so then you know they will not come off as you nip them up because the nut has turned about 360 deg under pressure so it's less likely to come off for sure I believe, not like the ones I have now that just go solid directly and maybe turn 5 deg at most I think.
I have been in a LH Torana with alloys when the rear wheel was about to come off driving on the highway, we were both pissed as, it was about 3 in the morning coming home to milk the cows and we thought what the is going on and pulled up and old mate did not have a jack or nothing, but a dude we know happened to just come along and fixed it all up for us before we knew it and off we went.
So the wheel does not just come off without warning before hand I believe.
On trucks you have to tighten all the nuts up and then go over them again in about 50 or 100 km after that's mandatory, one mate learnt that the hard way after seeing the wheel overtake him and head into the bush and he could not find it.