Fast Food For Impatient People

I had actually seen this long before now, but I realized today as I pulled into McDonald's that you hadn't, and so here's a picture:

What that is is two drive-thru lanes. There's only one pick-up lane, so they must use some complicated integration method to figure out who's who at the window (or just screw it up even harder than they usually do).
As a post script here to indicate how my life works, you can see how many people were in line when I took this picture. By the time I had wheeled around to order, there were three cars in each lane.