The premise that roads are the most important part of Pakistan's communications network is incorrect. The backbone of modern communications is telecommunications infrastructure—not physical transport.
Roads (National Highways, Motorways, provincial networks) move people and goods. They enable economic activity and physical access, but they do not transmit information. Conflating transport with communications confuses two distinct infrastructure layers.
Telecom infrastructure depends on roads for tower construction, fiber laying, maintenance access, and power supply. Conversely, modern logistics (ride-hailing, freight tracking, e-commerce) depend on telecom. They are complementary, not hierarchical in the way the question suggests.
Pakistan's communications network is telecom. Roads are the transportation network. Both are critical for development, but they serve fundamentally different functions.