Question

What does the statement mean that transit networks are built “on top of” highway networks

Answer 1

A transit network is a network that bridges a connection between two other networks, as well as passes traffic for its own network.

"On top of "has the following meanings

1. In complete control or with complete awareness of someone or something

2. In addition to something.

3. In very close proximity to someone or something.

In this case the second meaning would be the most appropriate one according to the sentence which means that Transit networks are built in addition to highway networks.

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