Tesco is bringing in a new system to keep shoppers safe at some of its larger stores.
The move follows the latest Government guidance which makes businesses responsible for ensuring their customers abide by the coronavirus rules.
Tesco has already said it will be imposing limits on some items amid reports of some people stockpiling.
There are fears there could be a second national lockdown and people have been panic buying with toilet role, hand gel, pasta and cleaning supplies among the items being snapped up.
Now Tesco is unveiling a new system.
CEO Jason Tarry said: "I wanted to share an update on what we’re doing to ensure that everyone can get the food they need in a safe environment.
"To help protect our customers and colleagues, we have introduced some new measures in line with current government guidance, and also made sure the safety measures we introduced at the start of the pandemic remain in place.
"We have good stock levels, so please shop as you normally would so that everyone is able to get what they need. We may apply buying limits to some essential products to help with that too."
He added: "There is still high demand for our online service, and we would encourage people who are able to shop in-store to do so, where we have a number of safety measures in place.
"To help more people shop in-store at times that are quieter or more convenient, we have extended the opening hours in many of our shops, although the majority remain closed overnight. To find the latest opening hours for your local store, please visit our store locator.
"In our larger stores, we now have colleagues at the entrances to help everyone follow the safety measures we have in place, and to answer any questions."
Unveiling the new system, Mr Tarry added: "Over the coming weeks, you will also start to see a simple ‘traffic light’ system at the entrances of some of our larger stores, to help us manage the flow in and out.
"Hand sanitiser and cleaning stations are available around our stores, and we continue to have social distancing guidelines and signage in place.
"When you visit our stores, please follow the legal guidance on wearing a face covering. If you forget to bring one, we have packs available to buy at the front of our stores, which you can open immediately and pay for with your shopping later. As a reminder, the police are able to issue fines for not wearing a face covering, unless you are exempt."
The introduction of traffic lights follows a similar system rolled out by Aldi several weeks ago.
