I just went through a drive thru and now this question just popped up in my head, and I really don’t see anything that could hint to an answer.
In: Technology
The same way a traffic light can detect traffic in certain lanes, you just run a loop of wire under the cement and the changing magnetic field of having a literal ton of metal stopped over it trips the controller to let the people inside know you’re there. It’s actually pretty cheap and efficient.
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