I would just shut the car off if you see the lines not moving. I haven't experienced this drive up line before and I think it's a little weird in this case since after you receive the shot you should wait either 15 minutes or 30 minutes to make sure you don't have reactions, so this would either mean each person takes about 5 minutes, then you drive your car to a waiting spot.. or somehow you get groups to go and sit.
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