Well, I see we have a bicycle at one end, what resembles half a Tomos moped at the other end, and a futon/chair in between.
So, I guess you could carry three people, but the poor guy on the moped seat has nothing to hold on to if you take a sharp left (well, not true. He could reach over and grab that black steel bar). And for sudden stops or really steep hills, there's no seat belt for the guy on the futon. Thus the necessity for padding on the steel bar.
Hmmm...nope. Not my cup of tea.