According to induced demand, the optimal highway would be one that is the smallest. Meaning 1 lane would be an optimal highway, but why is every country expanding their highways and by default they have more than 2-3 lanes.
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Optimal by what metric? The highway that moves the most amount of goods is the one the city cares about because that’s what highways are designed to do. A 3 lane highway will have the highest capacity and induced demand means more of that capacity will be used.
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