Replacing big transit vehicles with small ones puts more vehicles on the street to move the same people, which is the one thing a dense city has no room for.

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• No dense city anywhere runs without heavy reliance on transit, and no new transport technology changes the space arithmetic that makes that true. JWJarrett Walker4 Nov 2014
• Bus grids cannot function as a city's primary transit backbone at the scale of a very large, low-density city like Los Angeles, no matter how much priority the buses get. ALAlon Levy30 Jul 2026
• In low-density places driverless taxis really will beat buses, and transit agencies should hand that work over and concentrate on dense corridors. JWJarrett Walker4 Nov 2014
• Frequent fixed-route buses are the only way to cover a whole city with useful transit quickly, which makes them a land-use decision rather than a fallback. JWJarrett Walker21 Jul 2016
• Spreading jobs into a polycentric region does not cut commuting: transit ridership is weaker there than in cities with one strong centre. ALAlon Levy10 Mar 2026

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