Well maybe if all the space was not given to cars there could be some little space for those small lightweight vehicles which is much more efficient than those stupid fat trucks (EDIT: by which I meant SUVs and the likes)
Agreed, bicycle paths for bike delivery would be more efficient
Edit: I misunderstood what OP meant by trucks. NVM
How are light weight vehicles more efficient than trucks? That’s such a broad statement with absolutely no data provided to back it up. Efficiency matters a lot depending on the context. Delivering 40,000 kg of good cross country? Even a diesel truck is going to be more efficient than 10k little robot. Last mile delivery? Yes, obviously it’s not good to send a semi trailer to deliver a pizza.
The point is, those big fat trucks aren’t just there to annoy you, they are doing something pretty useful.