In Philadelphia, I passed under the Columbia Bridge by foot, and nearly fell over when I looked up. An entire section of the bridge has spalled and a huge gap of reinforcing steel rods is rusted and exposed. This bridge will collapse. I found no evidence that there is any plan to reinforce or replace it. Luckily it "only" carries CSX freight. Anyone passing under it should be extremely wary.

https://goo.gl/maps/uFkLJoKU1DB2 https://goo.gl/maps/767CYu5Mwd62 (it actually looks worse than this up close)

I'd be interested to find out what the track record is of maintenance of infrastructure by private vs public entities.