There's be no problem (technically) if there was a downward slope on the drive-through. That way you could just turn the car off, stick it in neutral, and use the hand brake to stop.
Seeing that this is more about social engineering than engineering, you'd need to ban drive-throughs if we are stuck with our 20 year or so supply of non-hybrid (mild or otherwise) used cars.
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"Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed." - Isaac Newton
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