About 12 years ago, a young 18 year-old in my family-in-law died in a car accident because his friend was driving recklessly and none of them were wearing seatbelts. It was a terrible ordeal for everyone, especially his parents, and I thought they would never recover from it (especially his mum). All these years later, they are now doing "okay" and have moved on, to the extent possible. However:
Do they now wear seatbelts when they travel by car? No.
Do they raise awareness in the community so that what happened to them doesn't happen to someone else? No.
Do they wear helmets on their bikes? No.
To me, the fundamental factor seems to be Buddhism and the inherent belief that if your time has come, then that is the way it is and it is not in your hands.