Notice the cabling on the sides to prevent movement from crosswinds. This is actually a fairly standard feature in pipeline bridges. Here is another example, although I have to say that I find the parallel main cable design puzzling for a single pipe. I like the bottom one, which splays those support cables to handle cross-winds.
Since bridges for transit are almost certain to be bidirectional, and since I have never really explored double track for PRT, I built a couple of 3D models. Note that there is no triangulated truss structure, since such short spans do not require it. Such sections would simply bolt together end-to-end, with each spanning the vertical support cables.