Thanks for the answer with the 2 examples. I am just an architect, but I am sure that it is always bad practice to just go to a place and see what they did. The request for a standard number - so the answer to go visit a place is no answer at all and suggests why bad design is so easily found...
I am trying to get good information on the minimum requirements for turning radius or radii for a typical drive through window - like at a Starbucks of Mickey D's. Is there a good standard to go by?