https://www.youtube.com/watch?v=eacLgrqRdyk
https://www.youtube.com/watch?v=gqc0KZRKreE&t=2s
https://www.youtube.com/watch?v=dishcgY0hEs
combine the technologies of the first two clips onto the technology of the third clip and scale it up a bit to get traffic drones that can carry 2800 kg and stay in air for several hours (as long as the cannister with the electrolyte produces hydrogen to fuel the generator that powers the elelctrics of the vehicle)
not inventing anything new, just combining already existing tech