The system by which goods are transferred from trucks approaching from one side of the checkpoint to trucks taking them onward from the other side. This system, too, is in use for the transfer of the sick from one ambulance to another. At almost all the checkpoints, those using them must walk a considerable distance from the vehicle in which they arrive at the checkpoint to another vehicle which carries them on the next leg of their journeys. This is particularly difficult for the sick, the elderly and people accompanied by several children. The term `back-to-back' gives no indication whatsoever of the extent of the suffering and injustice involved.