There was a time I didn’t wear seatbelts. Then I decided to wear them. I thought this isn’t so bad. A few weeks later I was driving to work. Due to road repairs, I wound up in the left lane. I needed to move over, so I checked the next lane and turned on my right signal. When I started to pull into that lane, a car suddenly sped up. I over corrected and hit the guardrail. My body started to go up and to right, but my belt kept me in place behind the wheel.
I talked to a police officer and he said that unbelted people have been thrown out of the car. Sometimes their own car rolls over them.