Waitrose confirmed that from March 13 it will introduce the green, amber and red codes, according to salt, sugar and fat content, across its main sandwich range and its healthy "perfectly balanced" snack range.
If it proves successful with customers, Waitrose will extend the traffic light labelling across its entire food range.
Christian Cull, marketing director at Waitrose, said it was the right thing to do. He said: "Shoppers want an honest, transparent form of signposting that allows them to make informed choices."
However, consumer groups have attacked supermarkets for unveiling their own versions of the controversial codes before the FSA's final consultation.
They say different variations of the government-proposed scheme will confuse consumers and supermarkets should wait until the FSA results next month.
Tesco and Sainsbury's introduced their own labelling systems last year.
Tesco uses signposts based on the government's guideline daily amounts while Sainsbury's has a colour-coded wheel.
The government document, 'Choosing Health', includes the implementation of a new "traffic light" system to identify unhealthy foods by early 2006.
Meanwhile, the FSA has tested four different labelling schemes with 2,600 people in order to reveal which one best helped them to understand the levels of fat, saturated fat, sugar and salt in food.
Of the two schemes that performed well, the FSA recommended the "multiple traffic light" scheme, with either a green (low levels), amber or red mark for each type of nutrient.
The other scheme, known as colour guideline daily amount, copied the traffic light scheme and expanded it with amount-per-serving and guidelines on daily amounts.
However, much of the food industry has rejected the government's proposals saying they would "demonise" certain foods that are healthy to eat in small amounts.
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