Food may be labelled with a traffic light label showing how much fat, saturated fats, sugar and salt are in that food by using the traffic light signals for high (red), medium (amber) and low (green) percentages for each of these ingredients.
The use of traffic light labelling is supported by many physician groups including the British Medical Association and welcomed by consumers.
This is not strictly a 'traffic light' but by analogy a scale of seven values that run from red to green through intermediate colours.
[citation needed] In the British Civil Service and other departments of the United Kingdom government, traffic light colours are used as a coding system for good or bad performance, usually known as a 'RAG rating'—Red, Amber, Green.
[citation needed] Various school cafeterias in the United States also use a traffic light like device to monitor noise levels among students.