These zippy motorcycles have become ubiquitous on streets and roads all over the world since their inception in 1914. The common definition of a scooter is, in this instance, a motorcycle with a step-through frame, as opposed to a step-over body, and the presence of a foot platform for the driver. The popularity of the scooter really took off after World War II, when companies such as the Italian firms Vespa and Lambretta launched some of their first popular scooters. With engines in the range of 50 cc to 250 cc, this type of scooter was intended to be a low-powered form of motorised transport, designed to get the driver from A to B as easily as possible. This type of transport has remained very popular due to the number of advantages motor scooters have over other common forms of transport, including their low cost to purchase and maintain, the ease of parking and storage, and the less strict licensing requirements for scooter use. Some scooters feature a storage space under the seat that can be accessed by lifting up the padded seat, space that can be used to store a helmet or transport goods safely while driving. Over the years, since their introduction, the design of the scooter has remained recognisably familiar; however, some diversification has taken place with new variations on the traditional design being produced. These variations include the three-wheeled scooters that have either two wheels at the back or the front, such as the Piaggio MP3 which was first made available in 2006. Other types of scooter include electric versions, the touring scooter, and the enclosed scooter.