20 minutes ago I was in Dunkins drive thru located in Stevensville Md. to order hot chocolate and 2 dozen donuts for my family.
When I started to ask for 3 chocolate dip, 3 blueberry, 3 glazed and so on to equal 12 for both dozen; I was told my order has to be mixed not selected or nothing because of the line - my family does not like all donuts in Dunkin therefore why would I want them. "WOW" what the heck does drive thru mean - is there a different version than McD's, Hardees etc...? I don't see them making customers take what is given due to the line.
If the line is to long for your staff; maybe you need to think about a staff who can handle the line.