For the pilots here, you'll know what I'm talking about when I say we do a pre-trip inspection of our bus before each trip to pick up the kiddos.
Part of that inspection is to look at each of the lug nuts to see if they have backed off at all.
While our school buses don't use them, the Metro buses use the loose lug nut indicators https://www.napaonline.com/en/p/TWRW...aAtfnEALw_wcB&
Yet, despite the best pre-trip inspection, stuff still happens. I was taking kids home and driving on pretty rough roads. The bus was feeling "weird", but I wrote it off to the road conditions. I was heading out of the city streets onto a downhill left sweeping highway entrance where the road was much smoother. That's when I knew something was wrong. I thought I had a flat.
Turns out, I had lost 5 of 8 lug nuts, the other three were loose, on my right rear outside wheel.
Apparently, the mechanic had changed tires and put the new tire on a wheel that was not a match for that setup. It wiggled just enough to allow the nuts to back off.
The mechanics drove the 20 miles to check out the problem, but they didn't have any extra lug nuts in the shop, so they did the old trick of borrowing one from each of the other tires, giving me six of eight, and still driving home on the Interstate with a ill fitting wheel.