Nobody in the illustrations is wearing their seatbelts. The kids get to sit in the windowless dungeon in the backseat after climbing over the seats in the front and the occupants heads are placed at exactly the right height to get decapitated by any semi or SUV bumper. The tires are so thin that stopping them in any short distance will be hard, even if you are only going 25 mph. And how, exactly, does a monorail car go from one track to another? And how does the battery 'mule' get from the launching point to the landing point?
Sorry, I give this student a C- in sustainable transportation technology class.