The This is part of California's universal helmet law.
Some jurisdictions have enacted partial helmet laws, which may require helmet use only for certain age groups or under specific circumstances (such as novice riders or those with learner's permits), while others have no helmet laws at all.
The reasons for implementing helmet laws vary, but they generally stem from concerns about public safety and reducing the severity of injuries in motorcycle accidents. Helmets are designed to protect the head and reduce the risk of traumatic brain injuries, which can be life-threatening or cause long-term disabilities. Helmet use has been shown to significantly decrease the risk of head injuries and fatalities in motorcycle crashes.
The specific regulations regarding helmet use are typically determined by lawmakers, who consider factors such as public health, road safety statistics, and input from various stakeholders. It's worth noting that these laws can be subject to change as new research, data, and perspectives emerge regarding motorcycle safety. Therefore, it's important to consult the most up-to-date information and the specific laws of the jurisdiction in question.