If the roads that are still passable deteriorate further without repair the only alternative would be air deliveries but these are about seven times more expensive than road transport and move less cargo. "The trucks we use transport about 40-45 metric tons per trip but a Mi8 helicopter (pictured) can only deliver about 2-4 metric tons depending on the distance it has to fly," said Peter Schaller Head of Logistics at WFP South Sudan. "On average it takes between 10 to 20 helicopter flight rotations for one truck delivery".