Search: bus benches humans only
Why: I have seen a few. They also have a no-robots logo. There is a website at the bottom, but I drive too fast to read it. Look like this:
Answer: They are for the Sony movie District 9, about aliens landing in South Africa, due out in August. There is tons of other viral marketing out there for it and a fake website, if you're into that sort of thing. PS: That's an alien, not a robot.
Source: ComingSoon.net
The More You Know: This movie is not animated (in case you thought it was, like I did). Watch an official trailer here.
