In a lot of countries any motorised vehicle moving in excess of a certain speed is subject to certain safety requirements (such as a helmet or an enclosure, ins

In a lot of countries any motorised vehicle moving in excess of a certain speed is subject to certain safety requirements (such as a helmet or an enclosure, insurance, and a driver's licence). If you take a bicycle, add a powerful engine, and ride it at 40km/h, then legally speaking you don't have an e-bike; you have a moped or whatever the relevant category is called in the local jurisdiction. To prevent everyone buying e-bikes from having to deal with safety requirements that are not deemed relevant below 25km/h, the lawmaker's have decided to limit this class of vehicle to those speeds.