Why are all forms of transport also called lines of communication?

Question

Accepted Answer

C. Messages were carried physically

1. Writing made messages depend on transport.
2. Hand, animal, boat, road, rail and air carried them.
3. So transport routes became lines of communication.
_Source: syllabus Geography, Fundamentals of Human Geography, Chapter 7, Tertiary and Quaternary Activities._

Answer

They run along telephone wires

Answer

They are owned by post offices

Answer

They carry letters and parcels

Why are all forms of transport also called lines of communication?

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