Some Popemobiles are open air, while others have bulletproof glass to enclose the Pope. (These were deemed necessary after the Ali Agca assassination attempt.) Some allow the Pope to sit, while others are designed to accommodate the Pope standing. The variety of Popemobiles allows the Vatican to select a vehicle appropriate for each usage depending upon the level of security needed and distance and speed of travel. The vehicle registration plate of the Popemobile reads "SCV 1". "SCV" stands for Stato della Città del Vaticano, the Italian name of the Vatican City State.