So I'm not usually the paranoid type (I said usually), but this one is a little creepy: According to Fast Company, Muni is going to deploy a camera system [1] that can detect criminal or potential terrorist behavior -- without a human being.
Not clear what happens when the cameras find something suspicious (and anyone who rides Muni knows that "anomalous behavior" is pretty standard fare). But I sense this could cause some trouble when over-anxious cops hyped on terror-watching charge into the tunnel to grab some guy who's pissing on the wall.
Unless the cameras decide that's "normal."
Links:
[1] http://www.fastcompany.com/1839052/big-brother-is-coding-you