As an aside, I fitted a camera on the back of my caravan that gives a constant view of whats behind and its a whole lot better than any mirrors I have ever had.
However, that is illegal here (source: WA Police) and can only be on when reversing. Reason given is it is a distraction to the driver!
I suggested the same could be said for for my navigation screen, double din multimedia screen, other driver aids now common in modern cars, etc, and of course the rear view mirrors if you constantly keep an eye on them.
Was told I would/could be fined if caught with camera on while driving.
My point being, technology has a simple and inexpensive alternative to the mirror fiasco but it is illegal under the traffic code.
Go figure.