This is a suspension bridge. No really, it is.
Or, it’s the starting point for one. You see a suspension bridge is really just a piece of rope, tied across a river. Everything else from that point on is just stabilization and convenience.
The basis for any suspension bridge is a piece of rope pulled taut across two points. But if you were to use that to cross a river, you’d need to either be a tightrope walker, or inch your way across by hanging underneath the wire, an inch at a time. While this might effectively get the job done, it is remarkably ineffective if you also want to get, say, your car across with you.
By adding two more ropes a bit higher up, and tying those ropes off to the base rope, you create a stable platform that will allow you to cross more easily, and without the need for a long balance bar, or a good set of gloves. But it still doesn’t make it convenient.
So suppose you add a second rope below, beside the original rope, and fasten planks between them. Suddenly you have a deck, and virtually anyone can cross on foot. Make the ropes strong enough, and the planks thick enough, and you can take a fairly substantial load. Keep upgrading each of those details, and you suddenly have a real live bridge.
In essence, this is the whole story of all the greatest suspension bridges in the world. But you don’t have to take my word for it: