dennis@home wrote
Rod Speed wrote

But may be useful if for example someone overtakes you
when you are going at the current legal maximum speed
and misjudges the speed of the oncoming traffic and
causes an accident when they have to pull into your
lane very suddenly etc.

If you can drive you would have seen that coming

Not necessarily, most obviously in rolling country
where the other car may well be over the rise and
not visible.

and taken avoiding action to prevent a crash involving you.

Not even possible if you can't see the other car until too late.

Of course if they pull into the side of you
the camera probably won't see it happen.

Depends on how wide a view it has. The best ones will capture that.