Generally agreed with this post except this point. I check behind constantly and manage distances with passing cars down to less than a foot. There's nothing scary about it if you're paying attention. Always ride like everyone's trying to kill you -- but don't take it personally.

Btw, one major advantage of helmet and glasses mounted mirrors over bar mounted aside from being able to view at any angle without distance distortion is that you can eliminate road buzz. I've used virtually every type of mirror over the years and for me the clear choice is Take-A-Look