Travellers who often make use of the railway during their stay in Italy might use Rail Passes, such as the European Inter-Rail or Italy's national and regional passes. These rail passes allow travellers the freedom to use regional trains during the validity period, but all high-speed and intercity trains require a 10-euro reservation fee. Regional passes, such as "Io viaggio ovunque Lombardia", offer one-day, multiple-day and monthly period of validity. There are also saver passes for adults, who travel as a group, with savings up to 20%. Foreign travellers should purchase these passes in advance, so that the passes could be delivered by post prior to the trip. When using the rail passes, the date of travel needs to be filled in before boarding the trains.