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Figure 1 – Solid waste collection
[Source: Nilesh Puery, b‐2]

 Collective antennas for wireless systems [b‐28]

 Ducted transport (e.g. pneumatic tubes [b‐28] or automatic railway [b‐10])

NOTE – Usually subway signalling systems (e.g., Leaky coaxial cable or rail transit wireless
communication system) are not taken into consideration as these are most likely to be an
independent underground service.

[b‐26] classifies the underground pipelines into 8 categories according to the functions, i.e. water
supply, drainage, gas, heat, electricity, telecommunication, industry and other pipelines (Figure 2).

390 ITU‐T's Technical Reports and Specifications