I've had the same thing happen to me.
😀
I use to work here but in the back there is a monitor and it can tell where the cars are in the line if it goes over like 3 minutes we have to pull customers up to keep that from happening. Mcdonald's isn't the only company who dose it
Apparently you have never worked in fast food.
It's for their drive thru times. To keep them down they have you pull off the marker to make it seem like they are fast pasted food delivery.
Procedure
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