San Mateo Bicycle Helmet Laws
Who Must Wear One, How It Should Fit, and What It Means for Your Claim.
California’s helmet rule covers riders under 18, and a good helmet protects riders of every age. But even a well-fitted helmet can’t stop a careless driver. Our attorneys help injured San Mateo cyclists hold that driver responsible.
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A Helmet Protects Your Head. The Law Protects Your Claim.
Head trauma is one of the most common injuries in a bicycle accident, and a helmet is your best defense against it. It helps protect riders from concussions and traumatic brain injuries that can bring lifelong complications. Even so, riders wearing helmets can still suffer serious, even fatal, head injuries when a driver hits them hard enough.
The helmet rules that apply in San Mateo are California state law, and they’re simpler than many people think:
Riders under 18 must wear a helmet on public streets, bike paths, and trails
Children riding in a carrier or bike attachment must wear one too
Adults aren't legally required to wear one, though every rider should
Whether or not you were wearing a helmet, a driver who caused your crash is responsible for the harm. If you were hurt, we can review what happened and estimate what your claim may be worth, free.
How to Fit a Helmet Properly
Buy the right size.
Especially for children, a helmet should be sized to the rider’s head now, not one they’ll “grow into.”
Make it snug all around.
There should be no spaces between the foam and the rider’s head.
Check that it doesn't move.
A properly fitted helmet stays in place when the rider moves their head.
Form a "V" under each ear.
The side straps should meet just below the ears in a V shape.
Center the chinstrap.
The strap should sit centered under the chin, and the helmet should never block the rider’s view.
What Your Claim Can Cover
Medical expenses
Emergency care, imaging, treatment for a concussion or brain injury, and the long-term care serious head trauma can require.
Lost income
The pay you miss while you recover, and reduced earning ability if an injury limits your work.
Pain and suffering
The physical pain and emotional toll of a crash, including the lasting effects of a brain injury.
Your helmet and gear
Replacement of a damaged helmet, bike, and equipment, along with other economic harm.
After a Crash: Helmet or Not, We Focus on the Driver
Insurers know helmet rules can be confusing, and some will use that confusion to suggest an injured rider did something wrong. We start where the claim really starts: with what the driver did. The police report, witness accounts, and scene evidence show whether the driver was speeding, distracted, or failed to yield.
Then we look at your injuries and your helmet. If you were wearing one, a damaged helmet shows the force of the impact and that you were riding responsibly, so keep it exactly as it is. If you weren’t, we look closely at whether that made any difference to the injuries you actually suffered. A helmet doesn’t protect a wrist, a knee, or a spine.
For children and teens, the helmet rule is a traffic rule. It doesn’t excuse a driver who hit a young rider, and we pursue the full cost of a child’s recovery.
California Helmet Law, Clearly Explained
Under 18: a helmet is required
Anyone under 18 must wear a helmet when riding a bicycle on public streets, bike paths, or trails. The same rule covers non-motorized scooters, skateboards, and roller skates.
Passengers count too
Children riding in a carrier or attachment on a bike must wear a helmet.
Private property is exempt, and so are adults
The rule doesn’t apply on private property, like a driveway or backyard, and riders 18 and older aren’t legally required to wear one.
The fine is up to $25
Riding without a required helmet in a covered location can bring a fine of up to $25. A missing helmet is a traffic matter; it doesn’t excuse a negligent driver.
What Our Clients Say
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San Mateo Bicycle Helmet Law FAQs
Does San Mateo have its own bicycle helmet law?
The helmet requirement that applies in San Mateo is California state law: riders under 18 must wear a helmet on public streets, bike paths, and trails.
Does the helmet law cover scooters and skateboards?
Yes. For riders under 18, it also covers non-motorized scooters, skateboards, and roller skates.
Does my child need a helmet in a bike seat or trailer?
Yes. Children riding in a carrier or attachment on a bicycle must wear a helmet.
Does the law apply in my driveway?
No. The requirement doesn’t apply on private property, like a driveway or backyard.
Can I get a brain injury even with a helmet on?
Yes. A properly fitted helmet significantly reduces the risk of head and brain injury, but it can’t eliminate it. Get evaluated after any crash involving a blow to the head.
I'm an adult and wasn't wearing a helmet. Can I still recover?
Yes. Adults aren’t required to wear one, and the driver who caused the crash is still responsible. The insurer may argue a helmet would have lessened a head injury; if that’s proven, your compensation can be reduced by your share of fault, but your claim doesn’t disappear.
What should I do with my helmet after a crash?
Keep it exactly as it is, along with your bike and clothing, until we’ve documented it. Then replace it; a helmet that has taken an impact shouldn’t be worn again.
How long do I have to file a claim?
Generally two years from the date of injury for a lawsuit, and six months for a claim against a government entity.
Get Your Free, Confidential Case Review, 24/7
Helmet or no helmet, the driver who hit you should pay for the harm. Call now or send the form; we respond fast, 24/7, in English, Spanish, or Korean. Your consultation is free and confidential. No fee unless we win.
Call (408) 256-2871Free Case Review
Solution Now Law Firm
1253 Park Ave
San Jose, CA 95126
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