So I lived in a building that had a small elevator and a tiny, virtually useless, mirror just to abide by regulations. Even though is was a small elevator, it

So I lived in a building that had a small elevator and a tiny, virtually useless, mirror just to abide by regulations. Even though is was a small elevator, it was easy to walk in without noticing someone was already in there. The bigger mirrors you normally see would have prevented that. I don't know the rational for this regulation, but my guess it's either for safety, or to ease the flow of people in & out of elevators.