Originally Posted by
volosong
I use a mirror also, but mostly to see if the traffic lane is clear so that I can get into the left-turn lane, or go into the traffic lane to avoid debris in the "bike lane".
I check mine constantly. And I've seen drivers nosing over into the shoulder, staring at their cellphone.
I haven't had to bail out yet, but one of these days ...
It's no panacea, tho ... I occasionally get surprised by an approaching auto, particularly on windy days or busy roads.
I think I'm getting one of those superbright rear lights. I don't see any negatives to it.