For students heading to the US, I bought a foldable electric scooter. May I bring it onto the subway?
In the United States, whether privately owned electric scooters are allowed on subways is not governed by a nationwide uniform rule. It entirely depends on the specific policies of the subway system operator in your city (such as MTA, BART, WMATA, etc.).

I. General Rules and Trends

①Generally permitted but with strict restrictions: In many major US cities, allowing folded electric scooters on subways is a mainstream trend. This is typically treated as an extension of "foldable bicycle" policies.

②Core requirement: Must be folded: Most subway systems that permit electric scooters require them to be completely folded, and their dimensions must not exceed luggage size limits (usually they should fit under a seat or be held on the lap without blocking aisles or doors).

③Possible prohibition during peak hours: Some systems (e.g., WMATA in Washington, D.C.) prohibit all wheeled mobility devices (including foldable bicycles and electric scooters) during weekday peak hours (typically 7:00–10:00 AM and 4:00–7:00 PM) to ensure sufficient cabin space.

④Battery safety is an implicit red line: Although policy texts may not explicitly state it, if your electric scooter's battery lacks authoritative safety certification (such as UL 2272), you will bear full legal liability in the event of an incident (e.g., smoke or fire). Subway staff have the right to prohibit any item they deem unsafe.

II. Specific City Policy Examples (Policies may change at any time. Be sure to verify before your trip!)

①New York City MTA:

Allows folded electric scooters and electric bicycles on subways and buses.

Prohibits riding on platforms or in cars when unfolded.

Dimensions should not obstruct other passengers.

②San Francisco Bay Area BART:

Allows folded electric scooters on board.

Similarly prohibits riding on platforms or in cars.

③Washington, D.C. WMATA:

Allows folded electric scooters smaller than 30” x 15” x 48” during off-peak hours.

Prohibits carrying during peak hours.

④Chicago CTA:

Policies are relatively open, allowing both folded and unfolded bicycles and electric scooters during off-peak hours. However, unfolded devices must use designated cars and must not obstruct others.

III. Important Action Recommendations

Confirm 100% before your trip:

Search on Google for “[Your city’s subway system name] + e-scooter policy” (e.g., “LA Metro e-scooter policy”).

Visit the official website of the subway system and look for pages titled “Bicycle and Scooter Policy” or “Code of Conduct.”

Be prepared to comply:

Always fold your scooter completely before entering the station.

Use a battery case or protective cover to avoid accidental short circuits.

Actively yield to other passengers and place the folded scooter in an unobtrusive location.

Avoid morning and evening peak hours to reduce the likelihood of being denied entry or causing conflicts.

Considerations when purchasing:

If you have a strong need to bring it on the subway, choose a model that is quick to fold, compact, and lightweight.

Ensure your electric scooter has safety certifications such as UL 2272. This is not only for subway access but also for your own and public safety.

Regarding electric scooters, American society is relatively liberal, but it pays close attention to details. Folding + checking local regulations + avoiding peak hours + ensuring battery safety will help you avoid much trouble.