Share 'Bike Mirrors'

I'm wondering how many people ride with some type of rear view mirror?  Recently I've heard to two very serious bike accidents where the cyclist was hit from behind; one resulting in death. I don't know if the riders had a mirror, but I'm wondering if that would have helped them.  My mirror is the kind that is attached to my helmet. (it's hand made by the fellow from Gambier, OH; it's a work of a…