This bridge that I drive under nearly every weekday has had some strange "repairs" done to it...
The support structures all seem to have been patched with very rectangular patches for some reason. My pictures aren't very good, but one of these jammy, trafficy, rush-hour mornings I'll roll by nice and slow and you'll see the crazy shapes. If you look at the far end of this one, you'll get the idea.
I like the way they look, but I'm not sure why they're there, or why the whole pillar structure wasn't just resurfaced entirely. Mysterious.