The solution: build a mall with the food court in the middle and a road that goes under that part of the mall. Each restaurant that you see in the food court is connected to a windowed alcove below, with elevators for humans and some kind of system for sending food down. You drive into the mass drive-thru entrance and into the lane marked for the restaurant you want to purchase from (say, Chik-Fil-A). The rest works like your average drive-thru. There would have to be a route at the end to circle you back to the entrance, like they have at airports, in case you were picking up food for officemates at different restaurants.