A quick google and we see California has some interesting laws
You can use a scooter with any class of driver’s license in the state of California. You do not need a specific license for scooters; however, you will need to have a driver’s license. since electric scooters are street-legal vehicles, you do not need to carry license plates or get registered with the DMV.
While on the road as a rider, you will have to obey the same safety and traffic laws just like other vehicles. Nonetheless, there are a few scooter-specific limitations in California:
• Electric scooters should not be driven faster than 15 mph on the road.
• The driver is not allowed to carry any passenger(s).
• Just like other vehicles, electric scooter should not be used on sidewalks.
• Scooters cannot be used on roads that have speed limits of more than 25mph unless there is a bike lane that can be used by scooter riders.
• The driver must wear a United States Department of Transportation-compliant helmet always while using the scooter.
The above regulations apply to standard electric scooters. On the other hand, mobility scooters can be driven up to 30mph on the road. Nonetheless, this law only applies to mobility scooters that are used by seniors or individuals with physical disabilities
I presume that the 25mph limit is our 50ks but not on footpaths?