San Mateo County Adopts E-Bike Rules With 5 MPH Sidewalk Limit and Fines

Last Updated on September 10, 2026 by Kristina

Update – September 10, 2026: San Mateo County supervisors unanimously adopted Ayden’s Ordinance on August 25, 2026. The new electric micromobility rules are scheduled to take effect January 1, 2027, so they are adopted but are not yet in force as of this update.

The ordinance includes a 5 mph sidewalk speed limit where sidewalk riding is otherwise permitted, escalating administrative fines, restrictions on unsafe riding, rules addressing illegal electric motorcycles, and additional enforcement tools. Riders can compare these local rules with California’s statewide framework in my California E-Bike Laws 2026 guide.

The ordinance applies within San Mateo County’s jurisdiction, primarily the unincorporated county. Incorporated cities are not automatically placed under the county ordinance, although county officials developed the measure partly as a model that cities could consider adopting or adapting. You can also follow the latest Electric Bike News coverage for related local and statewide developments.

Current Status: Ayden’s Ordinance Adopted August 25

The San Mateo County Board of Supervisors introduced the ordinance on August 11, 2026 and returned to it for final action on August 25. County records show the Board adopted the measure unanimously, and county officials identify the final measure as Ayden’s Ordinance.

The ordinance is scheduled to take effect January 1, 2027. That distinction matters: the measure has been adopted, but riders should not treat the new local requirements as currently enforceable before the effective date.

What San Mateo County’s New E-Bike Rules Do

Although e-bikes are a major focus, Ayden’s Ordinance is broader than conventional Class 1, Class 2, and Class 3 electric bicycles.

It regulates electric micromobility devices including legal electric bicycles, electric skateboards, motorized bicycles, and motorized scooters. It also addresses certain electric vehicles that resemble bicycles or motorcycles but do not qualify for legal operation under California vehicle laws.

5 MPH Sidewalk Limit Where Sidewalk Riding Is Otherwise Allowed

Where operation of an electric micromobility device on a sidewalk is otherwise permitted, the ordinance requires riders to:

• Yield to pedestrians and take reasonable care to avoid collisions.
• Give an audible warning before overtaking or passing someone.
• Travel no faster than 5 mph.
• Slow to walking speed or dismount when overtaking someone or when necessary to avoid a hazard.

The ordinance does not create a blanket right to ride an e-bike on every sidewalk. The 5 mph rule applies only where sidewalk riding is otherwise legal.

Unsafe Riding, Passengers, and Wheelies

Ayden’s Ordinance prohibits operating an electric micromobility device or illegal motorcycle in a manner that creates a danger to the rider, passengers, motorists, other riders, pedestrians, or property.

The ordinance gives examples that include carrying a passenger on a device not designed for passengers, carrying something that interferes with control or visibility, and performing dangerous acrobatics, tricks, wheelies, or stunts when the conduct creates a serious risk of injury, death, or property damage.

The Ordinance Also Targets Illegal E-Motos

One of the more important parts of the ordinance is its attempt to distinguish legal e-bikes from more powerful electric motorcycles and other vehicles that may be casually called e-bikes but fall outside California’s electric-bicycle definition.

California uses a three-class e-bike system. Vehicles that fall outside those definitions can instead be subject to moped, motorcycle, registration, licensing, equipment, or operating requirements depending on their design and capabilities.

San Mateo County’s ordinance uses the term “Illegal Motorcycle” for certain noncompliant vehicles and prohibits those vehicles from being operated on public streets, public rights-of-way, and other public places where they are not legally permitted.

Administrative Fines Range From $50 to $500

The adopted ordinance establishes escalating administrative penalties:

• $50 for a first violation.
• $200 for a second violation occurring within one year of the first.
• $500 for a third or additional violation occurring within one year of the first.

The ordinance also establishes an appeals process and allows financial hardship to be considered when an administrative penalty is reviewed.

Minors Can Use a Safety-Education Option for a First Violation

For minors, the ordinance includes an education-based alternative for a first qualifying violation in a 12-month period. A minor may be permitted to complete a traffic-safety education program instead of paying the administrative penalty.

The ordinance also authorizes the Sheriff’s Office, in qualifying circumstances, to impound a minor’s electric micromobility device or illegal motorcycle. An impounded device must be released to a responsible adult under the ordinance’s procedures.

Parking and Frame-Identifier Tampering Are Covered Too

The ordinance prohibits leaving an electric micromobility device or illegal motorcycle where it blocks the pedestrian portion of a sidewalk or pedestrian path.

It also prohibits removing, destroying, mutilating, or otherwise altering a manufacturer’s serial number or other permanent identifying number on the frame. This is an anti-tampering rule – it does not create a general county e-bike registration or serial-number-registration program.

Where the Ordinance Applies

Ayden’s Ordinance governs San Mateo County’s jurisdiction, primarily unincorporated San Mateo County. Incorporated cities such as Burlingame, San Mateo, Redwood City, and others retain their own governmental authority and are not automatically placed under the county ordinance simply because the Board of Supervisors adopted it.

County officials developed the measure partly in response to requests for a model ordinance that cities could consider adopting or modifying. That approach could eventually produce more consistent rules across the Peninsula, but riders should continue checking the rules for the specific city or unincorporated area where they plan to ride.

The County Had Been Working on E-Bike Rules for Months

The August 25 adoption was the result of months of county work rather than a policy created solely in response to one incident.

Supervisors Jackie Speier and Ray Mueller publicly pushed for a coordinated approach earlier in 2026, and a February forum brought together county officials, law enforcement, medical professionals, and safety advocates to discuss powerful electric vehicles, youth riding, and confusion over the difference between legal e-bikes and electric motorcycles.

An earlier version of the ordinance came before supervisors in March but did not move forward at that time. Officials later revised the proposal following additional outreach and a May 5 study session, then introduced the revised ordinance August 11 before adopting it August 25.

Ayden Fang’s Death Became Part of the Broader Safety Debate

The ordinance was ultimately named for 4-year-old Ayden Fang, who was killed in Burlingame on August 8, 2025 during a chain-reaction crash involving an e-bike and a car.

An 11-year-old boy riding an e-bike with his 10-year-old sister collided with a car exiting a parking lot. Burlingame police later said the e-bike rider had the right-of-way and, based on their investigation, was following state and local laws.

After the initial collision, the car suddenly accelerated onto the sidewalk and struck Ayden before crashing into a restaurant. Ayden died at the scene.

That sequence matters because it would be misleading to imply that police found illegal or reckless e-bike riding caused Ayden’s death. The crash nevertheless became part of a broader local discussion about youth riding, roadway design, e-bikes, and high-powered electric vehicles.

The incident later became the subject of a wrongful-death lawsuit, which Electric Bike Explorer covered in its report on the Burlingame chain-reaction crash.

What Riders Should Know Before January 1, 2027

As of September 10, 2026, Ayden’s Ordinance has been adopted but has not yet taken effect. Riders should continue following existing California law and any current local rules that already apply where they ride.

Beginning January 1, 2027, the new county rules are scheduled to add the 5 mph sidewalk limit where sidewalk riding is otherwise legal, the new administrative fine structure, unsafe-riding provisions, parking and identifier-tampering rules, and the ordinance’s additional enforcement tools within county jurisdiction.

Because incorporated cities are separate jurisdictions, riders crossing between city and unincorporated areas should not assume every nearby community has adopted identical rules.

My Take

I think one of the strongest parts of Ayden’s Ordinance is that it tries to separate legal e-bikes from high-powered electric motorcycles that are often casually called e-bikes. That distinction matters for both safety and fair enforcement.

A rider using a normal, legal Class 1, Class 2, or Class 3 e-bike should not automatically be treated the same as someone operating a vehicle that falls outside California’s e-bike framework.

The 5 mph sidewalk rule is also easy to understand as long as officials make the key qualification clear: it applies where sidewalk riding is otherwise allowed. The bigger challenge will be helping riders understand jurisdictional differences as they move between cities and unincorporated county areas.

📰 How This Story Was Verified

This update is based on San Mateo County’s Board of Supervisors legislative record, the adopted ordinance and Board materials, county statements about the August 25 final vote and January 1, 2027 effective date, California legal guidance, and reliable reporting on the Burlingame crash.

I have distinguished the ordinance’s adoption from its future effective date and have not described the January 1, 2027 requirements as already in force.

Sources

• San Mateo County Board of Supervisors – August 25, 2026 final action on Ayden’s Ordinance
• San Mateo County District 1 – August 2026 update on adoption and effective date
• San Mateo County Board of Supervisors – August 11, 2026 introduction
• San Mateo County – E-bike and e-motorcycle safety forum
• California Department of Justice – E-bike safety and legal requirements consumer alert
• ABC7 – Burlingame Police findings in the August 8, 2025 crash