On the back of many trailers, they have placard, “If you can’t see my mirrors, I can’t see you”.
Yeah, I’ve seen them. And I don’t like them, as even if you see their mirrors doesn’t mean they are angled to see you. The placard should say “If you look at my mirrors and can’t see me, then I can’t see you.”
If you cant see my mirrors, I cant see you.
When I was young and stupid I used to draft on the big rigs to save gas. ;-)