ICRC employees in Amman painting a large emblem on a tarpaulin intended to cover trucks bringing aid from Jordan to Iraq – In order to make full use of the protection afforded by the emblem in armed conflicts and ensure that the sign is fully visible, authorized users may display the largest possible size without any other indication. At night, the emblem may be lighted up or various technical means used to ensure that it is detectable. According to tests carried out, a pilot flying at 1,500 metres in clear weather should be able to see the shape and colour of a 3 by 3 metre emblem displayed on top of a building or on a protected vehicle.