I was at a severely overloaded grocery store pre-storm this past weekend, which had implemented two global queues (one for 20 items or less, one for everyone el

I was at a severely overloaded grocery store pre-storm this past weekend, which had implemented two global queues (one for 20 items or less, one for everyone else) in order to attempt to increase throughput and block the store less. The manager was actually going around asking people at the front of the line the time they got in line, in order to be able to measure time in queue. Didn't really matter, as they had every lane open already, but seemed like a way for the manager to know if more lanes were needed.