Head Injuries From Motorcycling Without a Helmet in California: Legal Rights and Risks

California Vehicle Code Section 27803 requires every motorcycle operator and passenger to wear a DOT-approved safety helmet at all times on public roads. This applies regardless of age, rider experience, or speed. Riding without a helmet greatly increases the risk and severity of traumatic brain injury (TBI) in a crash. Under California’s comparative negligence system, you may get less compensation if the lack of a helmet made your head injuries worse. Even so, an unhelmeted motorcyclist can still recover damages from an at-fault driver.

Key Takeaways

• California Vehicle Code Section 27803 requires all motorcycle riders and passengers to wear a DOT-approved helmet; a violation is an infraction
• Riding without a helmet does not bar you from suing an at-fault driver under California’s pure comparative negligence system, established by the California Supreme Court in Li v. Yellow Cab Co. of California (1975)
• However, the defense can argue your helmetless riding contributed to the severity of your head injuries, reducing your recovery proportionally for those specific injuries
• Traumatic brain injury (TBI), skull fractures, and fatal head injuries are significantly more common in no-helmet crashes
• Proving fault for the accident itself is separate from the helmet issue: the at-fault driver’s negligence caused the crash regardless of your helmet use

California’s Helmet Law (CVC Section 27803)

California Vehicle Code Section 27803 requires that any person riding or being carried as a passenger on a motorcycle or motorized bicycle on a public road must wear a safety helmet that meets Department of Transportation (DOT) standards. Helmets must be properly fastened with the chin strap. Riding without a DOT-approved helmet is an infraction, and total fines including mandatory court penalty assessments commonly run into the hundreds of dollars, with the exact total varying by county.

Head Injuries Without a Helmet: Medical Reality

Federal crash research relied on by the National Highway Traffic Safety Administration puts helmet effectiveness at approximately 37% in preventing fatal injury to motorcycle operators (about 41% for passengers), and separate federal crash-outcome data evaluation research found helmets to be roughly 67% effective in preventing brain injuries. In crashes where a rider is not wearing a helmet, injuries commonly include open skull fractures, diffuse axonal injury (DAI), subdural and epidural hematomas, severe traumatic brain injury requiring ICU care, and fatalities that might have been survivable with helmet use. Recovery from severe TBI can involve years of rehabilitation, permanent cognitive or motor deficits, and extensive medical costs.

How Helmet Use Affects Your California Injury Claim

California uses a pure comparative negligence system, established by the California Supreme Court in Li v. Yellow Cab Co. of California (1975) and applied alongside apportionment rules such as Civil Code Section 1431.2. If a court determines that your decision to ride without a helmet contributed to the severity of your head injuries, your recovery for those injuries may be reduced by the percentage of fault attributed to your helmet non-compliance. For example, if the jury finds you 25% responsible for the severity of your injuries due to helmetless riding, your recovery for those injuries is reduced by 25%. However, you can still recover fully for other injuries (spinal, orthopedic, road rash) that were unrelated to helmet use.

Critically, the at-fault driver who caused the crash is still liable for causing the collision. The helmet issue affects only the allocation of damages for head injuries specifically made worse by the absence of a helmet.

Contact The Accident Network Law Group

Helmet-use disputes are one of the most common defense tactics in California motorcycle injury claims, and untangling what a helmet would or would not have prevented requires medical and biomechanical evidence gathered early. Attorney Damoun Yazdi has 12+ years of California motorcycle accident experience and handles these comparative negligence disputes for riders throughout Costa Mesa, Riverside, Rancho Cucamonga, Apple Valley, Victorville, and the rest of Southern California. Consultations are free, we work on contingency, and Se habla espanol.

This content is for informational purposes only and does not constitute legal advice. The outcome of any case depends on its specific facts and circumstances. Past results do not guarantee future outcomes. Contact The Accident Network Law Group for advice about your individual situation.