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The background colour that says which class of road you are on.
Also known as: Road class colours, Direction sign colours
Sign background colour encodes road class, and the encoding is national: motorway signs are blue in Britain and much of Europe, green in Italy, Spain and the United States, and the classes swap colours across some borders. A driver reading colour as class must know the country.
Encode the class of road in the background colour of a direction sign, with motorways, primary routes and local roads each given a colour.
Contexts: Road signage
Assign the colours differently by country: motorway signs are blue in Britain and green in Italy, and the two countries swap the colours used for their other classes.
Contexts: Road signage
A large rectangular panel filled with a flat background colour carrying place names and route numbers in a contrasting colour.