Supermarket giant Tesco has joined other supermarket giants to launch a new traffic light system.
It follows Aldi and Home Bargains which have already installed, or working on bringing in, the prompters at stores.
The number of customers permitted to go into a supermarket has been limited in line with new coronavirus guidelines.
Tesco boss Jason Tarry sent an email to alert shoppers about the system.
He said: "Over the coming weeks, you will also start to see a simple 'traffic lights' system at the entrances of some of our larger stores, to help us manage the flow in and out."
However, it's not yet clear what kind of system this will be or which branches they will be enforced.
Aldi's current system involves LED lights being installed above the entrance to the store that changes colour when it's safe to enter.
It also relies on sensors placed in the doorways which counts how many people have entered and left the shop.
As for Home Bargains, the retailer teamed up with Hitachi for its sensor-controlled traffic light system which also tracks customers as they shop.
Meanwhile, this comes after supermarkets began to experience signs of panic-buying which caused them to bring in item limits.
Major UK supermarkets began to implement rationing and purchase restrictions back in September.
Morrisons was the first to announce the rules, with a three-item limit on most cleaning products, kitchen roll and other products.
Rationing has also been applied to sales of toilet paper, hand sanitiser and soap.
Restrictions will be sign-posted on shelf edges and at tills.
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