Thanks for all the replies.

It wasn't a big issue with me or anything like that. I was just curious what issues there would be if a bike was to use a drive through. It's not likely that a cyclist would be run over or anything, so where is the danger issue they claim? I mean, vehicles are going slow through the narrow entranceway and stopping at the box. Or are they (the restaurant) presuming that their customers are such poor drivers that anything in their path even at 1-2 km/h is likely to get mowed down? I couldn't see anything other than that a bike isn't heavy enough to trigger the ringer or something. Surely, they could come up with something so that motorcycles and bicycles could activate the ringer. Or, of course, they could put in bike-racks to lock up to. Motorists can park 10 feet from the door, but the nearest lock up for bikes is halfway across the parking lot. It's the motorists that need the exercise, not us.