I liked this blog post (it's been mentioned in other posts on the forum, sorry if it's redundant):

http://www.mrmoneymustache.com/2013/...ransportation/

I just pay attention to death rates per mile, as I'm not just heading out for an hour of bike riding. I'm going to work which is 9 miles in the morning, and 9 to 40 miles home after work. I'm going someplace. Bicycling is transportation for me. I don't think it's dangerous.