@JoshMorrison @pmarca Urban highway tunnels. Autos go almost anywhere O(n^2) vs. mass transit mostly linear O(n).
@JoshMorrison @pmarca Metcalfian transit challenge: design region pop. 10m : any person can meet any other any where in 40 min. 95% of time.
10:38 PM - 21 Oct 2014
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