It depends on the driver, the situation and the road. There are people who had an accident because of their recklessness itself. And their are people had an accident because of others doing. So,we can't really tell which one is safer as it varies in every situation.
driving a car is much safer than riding a bike because when an accident occur your body is protected by the car and also some features like the airbags are designed to reduce accident fatalities but in a bike all this are absent and people suffer more injuries from a bike accident.