Deletion of Mobility triangles

Comment: I rewrote and stubified the article so that it is cited, with four references, of which at least three are peer reviewed (unsure about the Burgess ref). It is no longer essay like, and my complete ignorance of the subject assures that there is nothing original in there. Hopefully it provides a nucleus for an article on this topic. The multiple references indicate to me that the subject is notable and the  problem is gone, which suggests that this article could be kept. In rewriting, I think the original essay has a lot of good information; the content just needs to be summarized, properly cited, and made more encyclopedic in tone
Stance: keep
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTESSAY)