E-Bike Crash in Sonoma or Marin: The Rules

An e-bike rider hit by a car has the same kind of claim as any cyclist, and our pedestrian and bicycle accident practice handles both. California law says a person riding an electric bicycle is subject to the same article of the Vehicle Code that governs bicycles (Vehicle Code 312.5(b)), and that article gives a cyclist the rights and duties of a driver (Vehicle Code 21200). What sets e-bikes apart is a set of extra rules tied to the bike's class and the rider's age.

Those extra rules come up after a crash in two ways. The other side may argue that the rider broke one of them and so shares the blame. And if the bike was modified beyond the legal limits, it may not count as an e-bike at all. This guide explains both, with the Marin County pilot program that lets towns add their own class 2 rules.

How does an e-bike crash claim work, step by step?

Identify the bike. The manufacturer's label must show the class number, the highest speed the motor assists to, and the motor wattage (Vehicle Code 312.5(c)). Photograph it before anything is repaired.
Identify the place. In Marin County, the town or unincorporated area matters, because each may adopt its own class 2 rules (Vehicle Code 21214.5).
Establish the other person's fault. A driver who passed too close, turned across the rider or opened a door into traffic broke the same rules that protect any cyclist; our guide on who is at fault when a car hits a cyclist covers them.
Expect arguments about the rider. Age, helmet and class rules may be raised to show the rider was partly negligent. If the violation helped cause the harm, a jury may presume negligence unless it was excused (CACI 418).
Divide responsibility. If both were careless, the jury assigns percentages, and the rider's damages are reduced by the rider's share (CACI 405 and 406).
Meet the deadlines. Two years for a claim against a driver (Code of Civil Procedure 335.1), and six months for a claim against a city, a county or the State (Government Code 911.2).

What are the e-bike classes, and what rules go with each?

An electric bicycle has fully operable pedals and a motor of no more than 750 watts (Vehicle Code 312.5(a)). The class depends on how the motor works and when it stops helping:

Class	How the motor works	Assistance stops at	Age rule	Helmet rule
Class 1	Assists only while the rider pedals	20 mph	No statewide minimum	Under 18 (Vehicle Code 21212)
Class 2	Can propel the bike by throttle alone	20 mph	No statewide minimum; in Marin, a town may bar riders under 16	Under 18; in Marin, a town may require it for all class 2 riders
Class 3	Assists only while the rider pedals; must have a speedometer	28 mph	16 or older (Vehicle Code 21213)	Every rider and passenger (Vehicle Code 21213)
Not an e-bike	Modified to go over 20 mph on motor power alone, over 750 watts, or with pedals removed	Not applicable	E-bike rules do not apply	E-bike rules do not apply

Class 1 and class 3 bikes may also have a walk mode that moves the bike on motor power alone up to 3.7 miles per hour (Vehicle Code 312.5(a)(4)). Every e-bike rider must also meet the general bicycle equipment rules, and since January 1, 2026 an e-bike must show its rear red reflector or red light at all hours, not only at night (Vehicle Code 21201(f)).

Does Marin County have different e-bike rules?

It can. The Marin Electric Bicycle Safety Pilot Program, added by AB 1778 and in effect since January 1, 2025, lets each city or town in Marin, and the County for its unincorporated areas, adopt an ordinance or resolution that does one or both of two things: bar riders under 16 from class 2 e-bikes, and require class 2 riders to wear a helmet (Vehicle Code 21214.5(b) and (c)). Each rule is optional, and each town decides for itself.

A town must run a public information campaign for at least 30 days before adopting a rule. For the first 60 days after a rule takes effect, violations get warning notices; after that, a violation is a $25 infraction, and a parent or guardian of a minor is jointly liable for the fine (Vehicle Code 21214.5(d) and (f)). The program ends on January 1, 2029 (Vehicle Code 21214.5(g)). It applies only to class 2 bikes; the statewide rules for class 1 and class 3 stay the same.

The reason for the program shows in the state's numbers. In the Office of Traffic Safety's 2023 rankings, Marin County was first of all 58 counties for bicyclists under 15 killed or injured, with 28, where a rank of 1 means the highest, or worst. San Rafael ranked 3rd of 103 similar-sized cities for bicyclists of all ages killed or injured. Our page on injury cases in Marin County lists the Marin court, claims and police offices. For the city itself, see our page on injury cases in San Rafael.

What about Sonoma County?

The Marin pilot does not reach Sonoma County, so riders there follow the statewide class, age and helmet rules in the table above. Local authorities and public agencies with jurisdiction over equestrian, hiking or recreational trails may ban e-bikes, or a class of e-bikes, on those trails by ordinance (Vehicle Code 21207.5(b)), so the posted rules on a park trail can differ from those on the road.

In 2023, Sonoma County counted 94 bicyclists killed or injured, ranking 18th of 58 counties (where 1 is the highest). The county's courts, claims offices and agencies are on our page about injury cases in Sonoma County.

Does a missing helmet or a broken e-bike rule hurt my claim?

It can reduce a claim, but it does not end one. California uses comparative fault: if the other side proves the rider was negligent and that the negligence was a substantial factor in causing the rider's harm, the damages are reduced by the rider's percentage of responsibility (CACI 405). The driver's share stays the driver's.

A violated safety statute can be used against the injured rider in the same way it can be used against a driver. If the rider broke a law, such as a 15-year-old riding a class 3 bike, and the violation helped cause the harm, the jury must find the rider negligent unless the violation was excused (CACI 418). The key word is cause. A missing helmet has nothing to do with why a car turned across the bike lane; at most, the other side may argue it made a head injury worse than it would have been.

That argument is close to the one drivers face about seat belts, explained in our guide on recovering without a seat belt. When the head injury is serious, how it is proven and valued is covered in how a brain injury claim is proven and valued.

Age matters in another way. A child is held to the care a reasonably careful child of the same age, intelligence, knowledge and experience would use (CACI 402). The Judicial Council's notes to that instruction quote a California Supreme Court decision saying a presumption from a child's statute violation may be rebutted by showing the child used the care children of that maturity ordinarily use.

What if the bike was modified, or the rider who hit me had no insurance?

A vehicle modified to go faster than 20 miles per hour on motor power alone, to have more than 750 watts, or to have its pedals removed is not an electric bicycle under the Vehicle Code (Vehicle Code 312.5(d)). Tampering with an e-bike to change its speed capability is barred unless it still meets the definition and the class label is replaced (Vehicle Code 24016(d)). If the bike in the crash was one of these, the e-bike rules in this guide do not apply to it, and which rules do depends on what the vehicle really is.

If you were walking and an e-bike rider hit you, the rider is responsible for injuries caused by a lack of ordinary care (Civil Code 1714(a)). But an e-bike rider is not subject to the Vehicle Code's financial responsibility, license or registration rules, and an e-bike is not a motor vehicle (Vehicle Code 24016(b)), so there may be no auto policy behind the rider. Whether a homeowner's or renter's policy applies depends on its terms. A rented, app-based e-bike is different: state law requires the sharing company to carry commercial liability insurance (Civil Code 2505), which our guide on e-scooter and shared device injuries explains.

If you were the e-bike rider and a car hit you, the driver's liability insurance is the first place to look. If it is missing or too small, see how uninsured and underinsured motorist coverage works.

What changes the answer?

The rider was under 16 on a class 3 bike. That breaks Vehicle Code 21213(a), and the other side may argue it shows negligence. Whether it helped cause the crash still has to be proven (CACI 418), and the child standard of care applies (CACI 402). A child's claim also has its own court steps; see injury claims for children.

The crash was in a Marin town with a class 2 rule. Only a town or the County that adopted an ordinance or resolution under Vehicle Code 21214.5 has those rules, and only through January 1, 2029. Check with the town where the ride happened.

The bike was on a trail. E-bike use on hiking, equestrian or recreational trails can be banned locally (Vehicle Code 21207.5(b)), and a public entity is not liable for injuries caused by the condition of a recreational trail (Government Code 831.4).

A pothole or broken pavement threw the rider. A public entity may be responsible for a dangerous condition of its road, with a six-month claim deadline; see bike crashes caused by a pothole in Sonoma County.

The bike failed. An e-bike must meet the federal bicycle safety standards and cut its motor when the brakes are applied, or have a switch that does (Vehicle Code 24016(a)). A brake, motor or battery failure may point to the maker or seller; our defective products page explains those claims.

What could this look like? An example

For example, imagine a 14-year-old riding a class 2 e-bike without a helmet in a Marin town that adopted a class 2 helmet rule under the pilot program. A driver backing out of a driveway does not look and hits the rider, who suffers a broken leg and a concussion.

The driver's insurer argues the rider broke the town's helmet rule and the statewide rule for riders under 18 (Vehicle Code 21212). Neither rule explains why the car backed into the street, so the driver's fault for the collision remains. The insurer may argue the missing helmet made the concussion worse; a jury would judge that argument under the child standard of care (CACI 402) and, if proven, reduce only the rider's damages by the rider's share (CACI 405). The broken leg is unaffected by the helmet question. This example is made up to show how the rules fit together; it says nothing about any real case.

What mistakes do people make after an e-bike crash?

Fixing or selling the e-bike before the class label, speed settings and motor are photographed and inspected.
Assuming the Marin class 2 rules apply everywhere in Marin, when each town decides.
Telling an adjuster the bike "goes really fast" without knowing its class or limits.
Throwing away a cracked helmet, which may be useful evidence.
Assuming the rider who hit them has auto insurance, when e-bikes are not covered by the financial responsibility laws.
Missing the six-month claim deadline when a road or trail defect was involved.

What should I do this week?

Get medical care and describe every symptom, especially any head strike.
Photograph the e-bike's class label, display, lights and damage, and keep the helmet as it is.
Write down the exact place, including the town or unincorporated area.
Request the crash report from the police or CHP office that responded.
Gather the purchase records or rental receipt for the bike.
Calendar the six-month and two-year dates; see California personal injury deadlines.

Frequently asked questions

Do adults have to wear a helmet on an e-bike in California?

On a class 3 e-bike, yes (Vehicle Code 21213(b)). On class 1 and 2, the statewide helmet law covers riders under 18 (Vehicle Code 21212), and some Marin towns may require helmets for all class 2 riders.

Can a 15-year-old ride an e-bike?

Statewide, a person under 16 may not operate a class 3 e-bike (Vehicle Code 21213(a)). Class 1 and 2 have no statewide minimum age, but a Marin town may bar riders under 16 from class 2.

Do I need a license or insurance to ride an e-bike?

No. An e-bike rider is not subject to the Vehicle Code's driver's license, registration or financial responsibility rules (Vehicle Code 24016(b)).

Can an e-bike rider be sued for hitting a pedestrian?

Yes. Everyone is responsible for injuries caused by a lack of ordinary care (Civil Code 1714(a)). Collecting may depend on whether the rider has a policy that covers it.

Does the Marin program change anything after 2028?

The statute is repealed on January 1, 2029 (Vehicle Code 21214.5(g)). A county that adopts a rule must report on it to the Legislature by January 1, 2028.

Is a throttle-only e-bike still an e-bike?

Yes, if it stops helping at 20 miles per hour and has working pedals and a motor of 750 watts or less: that is a class 2 e-bike (Vehicle Code 312.5(a)(2)).

If you were hurt in an e-bike crash in Sonoma or Marin County, contact Young Law Group today at (707) 343-0556 or through our contact page for a free consultation.

E-bike crash in Sonoma or Marin: do the e-bike class, age and helmet rules matter?