2 ms·
> In 2D, you can build a grid of straight line railways. Riders transfer zero or one times. Cost scales proportionally to area (and hence population) assuming c
by spywaregorilla 4y ago
> In 2D, you can build a grid of straight line railways. Riders transfer zero or one times. Cost scales proportionally to area (and hence population) assuming constant density. Time between two random points scales as sqrt(size). Ridership on a given rail segment scales like sqrt(size), which may be tolerable.
I doubt this would work. Cities don't do this for a reason.
Transit lines get built according to transportation needs, not mathematical coverage of the space. You have pockets of housing that need to get to pockets of commerce. You can't practically run transit cars connecting [0,0] and [end, 0].
- bobthepanda 4y agoA lot of big city metro networks look like grids in the city center, or effectively function as such. Farther out the grid is plugged in by bus.
- spywaregorilla 4y agoCan you provide an example of a city with a grid-like metro? I know many grid like cities. I cannot think of any grid like metros.
- bobthepanda 4y agoGrid like comes with a caveat. Most grids are only in city center (so that lines can connect to every other line in the city with most demand), and subways are not often grids but rather interlocking L shapes and curves depending on which radial direction out of city center got to have a subway first (but usually you can still see distinct gridlike patterns). And then there's geographic impediments like where streets and parks are. Beijing is a grid: https://upload.wikimedia.org/wikipedia/commons/0/07/Beijing_Subway_System_Map.svg https://upload.wikimedia.org/wikipedia/commons/0/07/Beijing_... Shanghai is a grid: https://en.wikipedia.org/wiki/Shanghai_Metro#/media/File:Shanghai_Metro_Network_en.png https://en.wikipedia.org/wiki/Shanghai_Metro#/media/File:Sha... Tokyo is grid-like east and south of the Imperial Palace: https://i0.wp.com/transitmap.net/wp-content/uploads/2020/11/Tokyo-Metro-Map-Mejia_2500px.jpg https://i0.wp.com/transitmap.net/wp-content/uploads/2020/11/... Taipei has a grid: https://english.metro.taipei/cp.aspx?n=1BE0AF76C79F9A38 https://english.metro.taipei/cp.aspx?n=1BE0AF76C79F9A38 The gridded portion of Manhattan has a grid between 14th St and Central Park: https://english.metro.taipei/cp.aspx?n=1BE0AF76C79F9A38 https://english.metro.taipei/cp.aspx?n=1BE0AF76C79F9A38. Buses fill out the grid in outer areas like the Bronx: https://new.mta.info/map/5366 https://new.mta.info/map/5366 Paris is gridded about as much as it can be due to the non-grid road layout: https://www.ratp.fr/sites/default/files/plans-lignes/Plans-essentiels/Plan-Metro.1653922257.pdf https://www.ratp.fr/sites/default/files/plans-lignes/Plans-e... Berlin is gridlike: https://sbahn.berlin/en/route-map/ https://sbahn.berlin/en/route-map/
- spywaregorilla 4y agoI feel like these are examples of what I was claiming more than anything