The sensors and processing needed to establish what load is carried and what state it is in ought to be specified, since a load may change the vehicle's height, width, length or mass (and so its routing), may be hazardous (flammable or corrosive liquids, affecting how the vehicle should behave in a crash), or may need watching in case it shifts or falls off.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.