In Boston, a big problem is at 2:30 AM after the bars close and people are wandering the streets to get home because public transit is also (inexplicably) closed. When everything is closed, how do you prevent people from pooping and pissing in alleys (or in broad streetlight)?

Or, for the opposite type of person, runners at 5 in the morning have the same problem. Miles away from home, sudden need to go to the bathroom, everything is closed.