I really have to wonder at people who have ALL kinds of things hanging from their rear view mirror!
I know I am old, but when I learned, it was illegal. Your entire view was to be free so that you could view a sudden movement from the side, such as a kid chasing a ball into street.
Now, they can't even SEE with a huge blind spot created by these Mardi Gras beads, their work badge, etc. And the swinging movement of their beads discounts the unexpected movement from the side.
And in my Tundra, the side view mirrors are so big, I definitely know there is a blind spot.
Wonder if anyone keeps track of types of vehicles are involved in the bike, pedestrian fatalities?