A line with fewer carts, rather than fewer people, tends to move faster overall, since cart size is usually a better predictor of checkout time than head count.
What Grocery Checkout Research Says About Saving Time and Money

A few small decisions at the checkout line can save both time and money on every single grocery run.
Pick the Shorter Line
Use Self-Checkout to Curb Impulse Buys
Scanning and bagging items personally at self-checkout tends to make shoppers more aware of what's actually going into the cart, which can help curb last-minute impulse grabs near the register.
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