So if this kind of car is not prohibited in some places, the traffic police may not check you when there is no traffic accident, but as long as there is an accident, check it. Moreover, if the speed of moped exceeds 20 per hour, it is prohibited by traffic law.
Besides, many of these cars are on the motorway, and non-motor vehicles can't get on the motorway.
In view of traffic chaos, speeding and illegal driving, people who are absent-minded when riding bicycles often have car accidents.
So now some places have begun to manage this kind of car, requiring license, driver's license, helmet, compulsory insurance and so on.