Actually not. German supermarkets use multiple queues for multiple cashiers. Studies have shown that a single queue feeding multiple cashiers is the most efficient method. A single queue feeding 3 cashiers is 3x faster than 3 single queues:

https://www.wsj.com/articles/SB10001424052970204770404577082...

I meant it in a sense of the cashiers’ speed in checking items. Do you know why German supermarkets don’t use the single queue multiple cashiers system?