Beneath the Bridges

What do you do below something big?This is a very general question, but an important one. Many pieces of urban architecture are quite large, especially overpasses, bridges, elevated rail, etc. And there are a lot of different approaches to what you put below that, from "nothing" to "actively hostile to homeless architecture" to "cool stuff."So let's consider the advantages of each.1. Nothing in ParticularSometimes you build something big and high, and just ignore what's down below.This bridge is up there, but there's nothing in particular brewing down here.This is common when the big thing is so big that it's just not really engaging with anything below it except at the ends--like this huge bridge in Seattle. This, to me, is a bit of a missed opportunity. No, I don't expect life underneath this kind of bridge to fundamentally transform, but the opportunity would exist to take advantage of the effect of the bridge--both aesthetic and physical, e.g. shade--and plan something around…