S-PLY: Sustainable supply of metropolises

Cities have a large economy confined to a small space. Supplying them is already a problem, and is expected to get worse.
Trucks navigate the entire city individually, often half-empty, stopping at every red light. This poses problems of ecology, air pollution, economic inefficiency, and city ergonomics.
Our design takes most of the commercial transportation and moves it underground, using the already existing underground metro infrastructure. The metro transports our supply box from the edge of the city into the delivery area with passengers, where at the station, our compact vehicle picks it up and makes the final route.