I found this post more relevant than most would. But amazingly you are safer 
biking than walking to work.
“Per kilometer, cyclists are 12 times more likely than car drivers to suffer a fatal accident, according to Rutgers University urban planner John Pucher and Lewis Dijkstra of the European Commission (the same study found traveling by foot to be 23 times more dangerous than driving, per kilometer).”
But you always have to weigh that against…
“On the other hand, a Danish study found that people who do not bike to work suffer a 39 percent higher mortality rate than those who do. So, assuming you can avoid a fatal accident on the road, biking to work may actually help you live longer.”