Final answer:
Wearing a helmet is the single most important thing you can do to improve your chances of surviving a collision.
Step-by-step explanation:
The single most important thing you can do to improve your chances of surviving a collision is to wear a helmet. Helmets are designed to protect your head and reduce the risk of severe brain injuries in the event of a collision. Wearing a helmet can significantly increase your chances of survival and minimize the impact on your nervous system.