If my wiki-searching is right, those vehicles were rear-wheel drive.
So, it only needed chains on the rear tires.
Preferable to have them on the front tires too, but not required.
The front left might have fallen off while he was driving, or he might have only had the third one to begin with (possibly as an extra) and added it for additional traction in these poor conditions (but it wasn’t enough).
Why is one of the wheels missing its snow chain ?!?
Probably a reason of the crash I guess
If my wiki-searching is right, those vehicles were rear-wheel drive.
So, it only needed chains on the rear tires.
Preferable to have them on the front tires too, but not required.
The front left might have fallen off while he was driving, or he might have only had the third one to begin with (possibly as an extra) and added it for additional traction in these poor conditions (but it wasn’t enough).