Auto accidents are a leading cause of death and injury in children, because virtually every child rides in a car every day. People don't generally ride bikes with kids in tow down car-jammed shoulderless 4 lane roads filled with cell phone yapping shoppers turning on and off the road every few hundred feet...if everyone did that, lots of kids would be getting killed/injured on bikes too. I don't need to a lot of "objective evidence" to tell me that the car is much safer. We bike when and where its safe to bike, which is almost everywhere, but there are situations where bikes don't really belong given the present traffic situation.