The point of comparison here would be a human delivery driver, who (as I understand) can be carrying multiple deliveries at a time. I think with Waymo's service

The point of comparison here would be a human delivery driver, who (as I understand) can be carrying multiple deliveries at a time. I think with Waymo's service, it's one delivery at a time, which results in more cars on the road for the same demand? (Or are there potentially several orders in the trunk when you go to get yours out?)