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This is just a guess: at the end of each partitioned lane there’s two red lights. On the far right side, you can see a little green light on one of them, with cars exiting from that side. I’m guessing they’re controlling when each lane gets to merge into the final booths, so it’s not as much of a free-for-all.
Not sure if this is what they’re talking about, but I bought my cat these treats that are little plastic tubes filled with tuna that I squeeze and she licks the end. Like a miniature meat Gogurt.