Mopeds are a class of low-powered motorized vehicles, generally two-wheeled. Moped classification is designed to allow the use of small motorised vehicles, avoiding the safety restrictions and licensing charges required of larger motorcycles. Some motorized bicycles, small scooters, and small motorcycles fit the definition of a moped. In many countries microcars like Aixam and Piaggio Ape are classified as mopeds because of their low top speed and small capacity engine.
In legal literature, mopeds are normally defined by limits on engine displacement, speed, power output, transmissions, or the requirement of pedals. In some countries, the legal driving age for a moped is lower than for larger motorcycles, and consequently mopeds are popular among the youth. Typically, mopeds are restricted to 30-50 km/h (19-31 mph) and engines less than 50 cc. Some localities require pedals, thus making them a form of hybrid vehicle, using both human power and machine power. Because of their small size, many jurisdictions consider them "limited speed motorcycle."