What are the colors of warning signs indicating upcoming hazards?
Black letters or symbols on a white background
Black letters or symbols on a yellow background
White letters or symbols on a blue background
White letters or symbols on a green background
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Answer
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Step 2: Understand the Question
The problem is asking about the standard color scheme for warning signs indicating upcoming hazards.
Final Answer
Black letters or symbols on a yellow background are the standard colors for warning signs indicating upcoming hazards.
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