Even watching the first video I had a feeling his basic design would not end well. He was unintentionally bottlenecking his entire population on top of the bottleneck being extremely inefficient.
In my opinion, it would be the best course of action to continue the massive one-way roads leading from the initial interchange. Then attach large roads horizonatlly to connect the other parts of your city. Continue building the large roads leading off the highway as your city expands.
Hopefully this makes sense:
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