So this is curious... there's a McDonald's in one of the smallish central valley towns (in Cali) that has a double-lane drive through, and they make a big deal of it (lots of signs and all). However, it's only double-lane up to the point at which you order. So there are two lines of cars ordering, but they merge to pay and pick up food. Can anyone explain why this is useful?
Seems to me that it doesn't alleviate any bottlenecks. The bottleneck at fast food places is almost always the food preparation, not the speed at which cars move through the line. If you had an amazingly good food prep crew, then maybe you'd benefit by having a complete double-lane drive through. But having two lanes which feed into one just seems silly.
And now I've devoted far more time and thought to this than it's really worth.
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