found in the design of signal technology. Why is the 3-dimensional signaling range crucial? Why is the 3-dimensional signaling range crucial? For a design of visual and audible signaling devices that only uses [...] a 3-dimensional space is determined based on the product parameters of the signaling device and the environmental conditions, in which the signaling device exactly fulfills the project requirement of [...] evaluation of audible signaling devices, the tone/frequency range used, the noise situation, as well as the distance to be maintained to the volume of the noise play a role. For visual signaling devices, minimum