Road and traffic signs

At roadworks you often see temporary warning signs. What colour background do they usually have?

Green with white text
Blue with white text
Yellow with black text
Correct
White with red text

Why?

Temporary signs at roadworks usually have black symbols and text on a yellow background so they stand out from permanent signs and catch your eye. Rule 288 of The Highway Code says you should take extra care and obey all signs and any people directing traffic at roadworks.

Highway Code rules 288, Traffic signs

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At roadworks you often see temporary warning signs. What colour background do they usually have?

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