Michigan.gov website references Merriam-Webster dictionary definition "an unfortunate event resulting especially from carelessness or ignorance".

Then it says no one is at fault, but the definition specifically included carelessness and ignorance which does imply fault.

> Calling a crash an “accident” suggests no one is at fault. In reality, crashes result from preventable actions like distraction, inattention, or risky driving.

But all of these go under carelessness / ignorance.

And there is always a party that's at fault traffic accidents.

Normal dialogue:

Bob: I got into a traffic accident.

Alice: Who was at fault?

Bob: ...