Never have, I hope to keep it that way. I know some life-long bike commuters at work who never had an accident, so it's possible. I just do my best to ride defensively and be aware of what's happening around me and I avoid trouble spots, even if that means a longer route and I ride an MTB with fat tires. I know a large part of this is luck since you can't account for everybody else's actions and predict everything, but I'm trying

On a side note, I know a guy who got doored on his first bike commute.

Good luck all.

Adam