Accidents can be scary

Excerpt from California Driver Handbook's Seatbelt section:

 

The pictures illustrate what can happen in an accident. Your car stops, but you keep on going at the same speed you were traveling until you hit the dashboard or windshield. At 30 mph this is like hitting the ground from the top of a three-story building.

When I jumped off my bike, I was going at about 30 or 40kmph speed.  No wonder I broke my leg so badly!