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1.The signalling with regard to a prohibition, a warning and a command, as well as the signs with regard to the localization and the identification of life-saving devices or aids permanently takes place by means of signposts. 2.The signalling for the localization and identification of...
1.A sound signal: has a sound level which is clearly higher than the level of the ambient noise, so it is well audible, but not too loud or painful to the ears; is readily recognizable; is readily distinguishable from another sound signal and other ambient...