Abstract: A lightweight, strong, not easily destructible material, in the form of pellets such as lightweight aggregate of burnt expanded clay, shale or slate, foamed glass, cinder or granulated plastic, with a density of up to about 40 lbs per cubic ft., is being placed on the ground where the impact reduction is desired. The dimensions and the amount of the material are related to the type, weight and speed of the object that can make the impact. The pellets of the lightweight material are not bound or connected to each other except for the surface of the wall, which is bound together by cement, plastic, nets or plastic liners applied in situ or prior to the installation for example with gabions (net boxes). The sloping of the wall of the lightweight material is vertical or at least more steep than the natural angle of repose for the lightweight material.