It's possible to say that one system of roads communicates with another, but to describe a system of roads as a communication system would not be understood, I'm afraid.
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AnonymousSo, can I then say that 'a roundabout is being built in order to facilitate the city's road system'I'd say the term is okay here, but without context, this strikes me as a mismatch in scope.
Anonymousa roundabout is being built in order to facilitate the city's road systemfacilitate doesn't easily take a noun that represents concrete things. Not even transportation infrastructure, which is closer to what you're looking for, can be 'facilitated'. You can facilitate traffic flow, however. I suggest something like this: