What is the primary purpose of wearing a helmet while riding a bike?

The primary purpose of wearing a helmet while riding a bike is to protect the head from injury in case of an accident. Helmets are specifically designed to absorb impact energy during a crash, which can significantly reduce the risk of serious head injuries, such as concussions or skull fractures. This protective function is critical, as biking can involve falls or collisions that pose a threat to a rider's safety.

While maintaining a fashionable appearance, enhancing visibility on the road, and keeping hair from getting messy are all considerations that some riders may think about, they do not address the primary safety concern associated with bike riding. The foremost reason to wear a helmet should always be protective; ensuring the rider’s head is safeguarded against potential injuries is the most crucial factor.