Overall mortality risk is lower on a bike. On average a full-time bicycle commuter will live longer than the same guy driving every day, because the guy in the car is safer while travelling, but will have a much higher incidence of diseases which are less likely to happen to people who get daily vigorous exercise.

In other words, odds are the guy in the car is going to die in a hospital bed of cancer or heart disease while the other guy is still out riding around on his bicycle.