The rules depend on the vehicle's legal category, not on what it's called in the store.
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E-bikes: Class 1, 2, 3
In most states, Class 1 bikes assist only while you pedal, up to 20 mph. Class 2 bikes have a throttle, up to 20 mph. Class 3 bikes assist while you pedal, up to 28 mph. Some states, like Pennsylvania, don't use classes at all.
Stand-up electric scooters have rules that change a lot from state to state. They're legal in NYC, LA and Chicago, but Pennsylvania still doesn't allow personal e-scooters on public roads.
A golf cart isn't the same as a low-speed vehicle (LSV). An LSV meets federal safety standards and can be registered. Golf carts usually need a local ordinance to use any public road.
Not legal advice. We summarize public sources and link every rule to its source. Local rules and posted signs can be stricter, so always check your local ordinance.