What does Abundant Access mean?

Screen Shot 2015-11-05 at 7.21.13 AMI find myself returning over and over to this post by Jarrett Walker:

“Abundant Access”: a map of a community’s transit choices, and a possible goal of transit

“In my book Human Transit, I argued that the underlying geometry of transit requires communities to make a series of choices, each of which is a tradeoff between two things that are popular.  I argued that these hard choices are appropriate assignments for elected boards, because there is no technical ground for making one choice or the other.  What you choose should depend on what your community wants transit to do.”  Read more.