An exhaust system that processes exhaust generated by an engine is provided. The medical device comprises an expandable tubular body that includes an integrated resilient support structure that forms a plurality of electrically conductive regions to which the lead is coupled. The method is characterised in that the or each diatomic bridge has at least one vibrational mode that causes the two atoms on either side of the bridge to be moved together to a similar or greater extent than competing vibrational mode that cause the two atoms on either side of the bridge to be moved apart. A super body may then be constructed that represents the determined at least two three dimensional objects, and a motion of the super body computed at a physics simulation engine to simulate motion of the super body and any remaining three dimensional objects that are not part of the super body. It is provided that the camera device is situated on the safety helmet in such a way that it at least partially detects the facial area, the camera device being connected to at least one warning device which outputs a warning as a function of data collected by the camera device.