Of course, you would have to design it so that the drivers could reach all the selections on the menu from their car's window. Maybe it would be easier to have a trackball or mouse or something. You could even use the same method for ordering at the inside counter, but then all those high-school kids would lose their jobs.

Once I was at a high-school event and the staff had accidentally left the pop and candy vending machines on. There was this big-long slow line for the window where the kids were selling food and drinks, but a very fast-moving line in front of the machines. It seems to me that machines are better at some things than people.

Yes, I know that the machine can't smile at you or say 'thank you.'

If I'm going through a drive-thru I'm almost certainly planning to eat my meal in the car, probably with my hands. In that case I have no way of washing my hands; and I would hate to think that I just touched something that hundreds of others have just touched. Portable hand sanitizer would help, but still... ICK!