For an AV able to carry passengers, the sensors and processing that tell whether anyone is on board ought to be specified, because the right reaction to a failure differs between an occupied and an empty vehicle. The notes add that the number of occupants changes vehicle mass and may affect the control strategy, and that where people sit and whether they wear seat belts may also need to be sensed.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.