Abstract: A safety wall intended to be placed in front of at least one obstacle for partially absorbing a collision impact with said obstacle, the said safety wall comprising a first element (1) having an intake (3) arranged so that it can be connected to a pressurised air source, the said first element (1) being arranged to be inflated with air to a first predetermined pressure and having a collision zone (4), the said first element (1) also being connected to a second element (2) arranged to be inflated with air to a second predetermined pressure.