"No soup for you!" - Yev Kassem (from Seinfeld)
I did a local television news feature story some 22 years ago when the third bank in Corpus Christi built a skywalk across an intersection. It seemed like it was the thing a bank needed to do to keep up with the other institutions that had one. I called my story "skywalk one-upmanship."
I don't have a picture, but I see the skywalks frequently. One feature I notice is that they have steel trusses with diagonal members INSIDE the structure, usually visible through the glass "wall". One skybridge runs at a 45 degree angle across an intersection with about 18 feet clearance. It is enclosed with gray-tinted glass walls-- clear glass except for the bottom and top 3 feet or so of the structure, where there is opaque but glossy black glass. Through the windows can be seen the trusswork. It is lighter than a vehicle or railroad bridge because it has to hold only the weight of the structure itself and the pedestrians.