California Bicycle Laws: Equipment, Passing, and E-Bike Rules

California bicycle laws treat every bike as a vehicle, so if you ride on public roads you follow the same traffic rules as drivers, carry specific equipment, and gain specific legal protections in return. The rules cover how you ride, where you ride, what your bike must have on it, and what happens if a driver hits you or passes you too closely.

Traffic Rules Cyclists Must Follow

Because a bicycle is legally a vehicle, you obey every traffic signal, stop sign, and right-of-way rule that applies to cars.¹ Full stop at red lights and stop signs. Yield to pedestrians in crosswalks. Don’t run a yellow you can’t clear. Fines for running a red on a bicycle start at $100 and grow quickly with court fees and surcharges.

Ride with traffic, not against it. On a one-way street with two or more marked lanes, you can ride near either the left or right edge of the road.²

Hand Signals

You must signal turns and stops using hand signals, and you must begin signaling at least 100 feet before the maneuver.³

Left turn: left arm extended straight out.
Right turn: left arm bent upward at a right angle, or right arm extended straight out.
Stopping or slowing: left arm extended downward.

Signals are given from the left side, with the single exception that a right arm can be used to point right for a right turn.⁴

Headphones and Earbuds

Covering both ears while riding is illegal. One earbud is fine; two is not, and the ban includes bone-conduction headphones that sit on both ears.⁵

Where You Can Ride

If you’re moving slower than traffic, the default is to keep as far right as practicable. That word carries real weight. The law lists specific situations where you can take a more central position in the lane:¹

Passing another bicycle or vehicle going the same direction.
Preparing for a left turn at an intersection or driveway.
Avoiding hazards like debris, parked cars, potholes, or pedestrians.
Riding in a lane too narrow to share safely with a car.
Approaching a place where a right turn is authorized, if you’re going straight.

That last one catches people out. If the right lane is a right-turn-only lane and you’re continuing straight, you don’t have to ride in it.

Bicycle Lanes

Where a bike lane is marked and you’re going slower than traffic, you must use it. The same exceptions apply, so you can leave the lane to pass, avoid a hazard, or set up a left turn.⁶

Sidewalks

State law does not ban sidewalk riding outright. It hands the decision to cities and counties.⁷ Many California cities do prohibit it, at least in business districts, so check your local ordinance before assuming a sidewalk is fair game.

Required Equipment

Brakes

Every bicycle on a roadway must have a brake capable of making one wheel skid on dry, level, clean pavement.⁸ Fixed-gear setups that rely only on backpedaling resistance generally don’t satisfy this standard.

Lights and Reflectors at Night

“Darkness” runs from half an hour after sunset to half an hour before sunrise. During that window, your bike needs:⁸

A white front light visible from 300 feet ahead and from the sides, mounted on the bike or worn by the rider.
A red rear reflector, or a solid or flashing red rear light, visible from 500 feet behind.
White or yellow pedal reflectors, or reflective material on the rider’s shoes or ankles, visible from 200 feet.

A lot of night-riding tickets come from missing pedal reflectors. Reflective ankle bands are a cheap fix if your pedals don’t have them built in.

Helmets

Anyone under 18 must wear a properly fitted and fastened helmet when riding on any street, bikeway, or public path. The helmet must meet ASTM or U.S. Consumer Product Safety Commission standards.⁹ The rule also covers passengers in child seats or trailers, plus kids on skateboards and scooters. There is no statewide helmet requirement for adults on regular bicycles, though the e-bike rules below are different.

The Three-Foot Passing Law

Under the Three Feet for Safety Act, a driver overtaking you must leave at least three feet of clearance between any part of the vehicle and your bike or body. If a second lane going the same direction is available, the driver must change lanes entirely to pass.¹⁰

When conditions make three feet impossible, the driver must slow to a safe speed and pass only when doing so won’t endanger you. A violation is an infraction with a $35 base fine. If the unsafe pass causes a collision that injures the cyclist, the fine rises to $220.¹¹ Knowing the rule matters twice over: it gives you standing to report dangerous passes, and it helps establish fault after a crash.

Electric Bicycle Rules

California sorts e-bikes into three classes. All must have working pedals and a motor no larger than 750 watts.¹²

Class 1: pedal-assist only, motor cuts out at 20 mph.
Class 2: throttle-assisted, motor cuts out at 20 mph.
Class 3: pedal-assist only, motor cuts out at 28 mph, speedometer required.

Class 3 riders must be at least 16 and must wear a helmet regardless of age. Class 3 e-bikes also can’t carry passengers.¹³ For Class 1 and Class 2, the standard under-18 helmet rule applies and there is no minimum age.

Class 1 and Class 2 e-bikes are generally allowed anywhere a regular bicycle can go, including bike lanes and multi-use paths, unless a local authority posts signs restricting them. Class 3 e-bikes can use roadways and bike lanes but are prohibited on most multi-use paths and trails unless a local ordinance specifically permits them.⁷

Cycling Under the Influence

Riding a bike while impaired by alcohol, drugs, or a combination is a misdemeanor sometimes called CUI. The maximum fine is $250. A CUI conviction does not carry jail time and does not appear on your driving record as a DUI.

For adults 21 and older, a CUI conviction has no effect on a driver’s license. Riders between 13 and 20 face a one-year license suspension on conviction, and if they don’t yet have a license the court orders a one-year delay before they can get one.¹⁴ That delay can be lifted early if the person goes 12 months without another qualifying conviction and petitions the court. Officers can still require a chemical test during a CUI arrest.

If a Car Hits You

Get to safety and get medical care first. After that, a few steps protect any claim you may need to make:

Call the police. California law requires reporting any crash that causes injury or significant property damage, and the report becomes the anchor for later insurance claims.
Document the scene. Photograph your bike, your injuries, the vehicle, the license plate, and the road. Trade contact and insurance information with the driver.
See a doctor promptly. Some injuries don’t produce symptoms right away, and a same-day record links the injury to the crash.

If the driver is uninsured or leaves the scene, your own auto insurance may still cover you. Uninsured and underinsured motorist coverage typically follows the policyholder onto a bicycle. If you don’t own a car, you may be covered under a household member’s policy. It’s worth checking your coverage before you need it.

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California Legislative Information. California Vehicle Code VEH 21202
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California DMV. Bicyclist and Pedestrian Safety
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California Legislative Information. California Vehicle Code VEH 22108
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California Legislative Information. California Vehicle Code VEH 22111
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California Legislative Information. California Vehicle Code VEH 27400
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California Legislative Information. California Vehicle Code VEH 21208
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California Legislative Information. California Vehicle Code VEH 21207.5
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California Legislative Information. California Vehicle Code VEH 21201
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California Legislative Information. California Vehicle Code VEH 21212
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California Legislative Information. California Vehicle Code VEH 21760
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California Legislative Information. California Vehicle Code VEH 21760
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California Legislative Information. California Vehicle Code VEH 312.5
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California DMV. Two-Wheel Vehicle Operation
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California Legislative Information. California Vehicle Code VEH 13202.5