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To put it another way, drawing the colored lines on the map makes for a nice picture, but it ignores the very real geometrical constraints that such a system would face in operation.

Jarrett Walker does a great bit on the varying issues of emotion and cold, hard facts like geometry:

http://www.humantransit.org/2010/08/a-field-guide-to-transit-quarrels.html

His case study is the BART extension to SFO, which uses an awkward wye alignment that cuts frequency in half for each of the legs and is very confusing for users, but it was a simple diagram that politicians liked - no matter how problematic it was in a technical sense.

Scotty said it best: "I cannah change the laws of physics..."

by Alex B. on Jan 24, 2011 2:54 pm • link • report

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