1. Intrinsic features
1.1. Verbal communication between a speaker or emitter and one or more hearers shall take the form of (sometimes coded) short texts, phrases, groups of words or individual words.
1.2. Spoken messages shall be short, simple and clear as possible and in a language understood by the persons involved; the verbal skills of the speaker and the hearing abilities of hearers shall be such as to ensure reliable verbal communication.
1.3. Verbal communication may be direct (by means of the human voice) or indirect (by means of a human or artificial voice which is broadcast by whatever means is appropriate).
2. Specific rules governing use
2.1. The persons involved must have a good knowledge of the language used so thst they are able to pronounce and understand the spoken message correctly and consequently behave in a way which is appropriate to safety or health (or both).
2.2. If verbal communication is used instead of or together with gestures, code words sho
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