Electric bikes are typically restricted to a certain speed limit to ensure that they are classified as bicycles, rather than motor vehicles. According to federal regulations, an electric bike must: have fully operational pedals, be equipped with 750 watts or less, and the maximum speed that can be attained with assistance from the motor is 20mph (source: [EVELO](https://evelo.com/blogs/learn/why-is-there-a-20mph-speed-limit-on-electric-bikes)). Class 3 e-bikes can have a top assisted speed of 28 mph (45 km/h) (source: [FuturaRide](https://futuraride.com/e-bike-speed-unlock-ultimate-guide-unlocking-electric-bikes/)). One of the reasons for this speed limit is to encourage people to pedal manually and not treat e-bikes as motor vehicles (source: [GoDownsize](https://www.godownsize.com/electric-bikes-slow-speed-limited/)).
Electric bikes are restricted to a top speed of twenty miles per hour simply because of traffic rules.
Electric bike companies are only allowed to manufacture electric bikes that have passed the standards of their country’s rules.