Of course, there was a way to get from one story of these 30 rooms to the other story of this 3-story section of side rooms that were all around the Temple. This passageway widened from the lowest story to the highest story. There was a set of stairs all around the Temple. Thus, you ascended to the highest story from the lowest story via the middle story.
Here we have a summary of all that had proceeded. The Israelites were to go through the gates in order to prepare a way for the others to come. They were to build up the highway and clear it of stones so that it would be a level road to walk on. They were to lift up a symbolic sign over the people. Yahweh has proclaimed to the ends of the earth that his daughter Zion will be saved. Zion was to receive their rewards and compensation. They were to be called the holy people, the people redeemed by Yahweh. They would be a city sought out and not forsaken. Jerusalem would be restored as a shining city on a hill.
Second Isaiah seems to have Yahweh imply that there will be second Exodus. Yahweh would make a way for them through the sea and the mighty warriors. Despite the fact that chariots, horses, armies, and warriors will come after them, these armies will lie down and not rise again. They will be extinguished like a candle wick. They should not remember the former past old things because there will be a new way in the wilderness. They should be able to see it, since there will be rivers in the desert.