I think that it depends on the car's safety like the structure of the body, as the body absorbes the G-force of the impact. Then there's the fact of airbags in the car, which is really important as you don't have it with motorbikes. Overall, I wouldn't go for motorbike in my life, I'm training as a Paramedic, so I've seen some shocking accidents with a head there and leg somewhere else. So, you know, it's not a nice picture, if you see a human body all over the place. So, please be careful on the roads!