A few years ago, run-away truck wheels on multi-lane freeways around Toronto, Ontario killed a number of people, 6 maybe, in a spate of shocking accidents that received intense media coverage. The wheels typically bounced across the median barrier into the windshield of an oncoming car - and the driver or passenger was killed before an opportunity for an avoidance manouver. The wheel separations were all do to cracked wheel components, bearings, lug nut failure, etc. do to inadequate maintenance and repair. Truckers complained they were assigned trailers by dispatchers and while responsible for their own trucks, they had little knowledge of the state of the trailer's repair. Legislation was quickly passed that mandated better wheel maintenance, inspection and highway enforcement with stiff penalties for violations. Runaway wheels on commercial vehicles are indeed avoidable.

I can't recall any runaway truck wheels since. I shudder to imagine the result of a cyclist being hit by a spinning vehicle wheel. The Fox has good reason to feel shaky....