What flag never flies but can still warn you? - Answer & Hint

What flag never flies but can still warn you?

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Hint: It is a warning sign.

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The answer is

A red flag in a message or situation.

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A red flag is a figurative warning sign, not necessarily a piece of fabric.

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What bridge can carry a friendship but not a footstep?

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The answer is

Trust.

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I have cities but no houses, forests but no trees, and water but no fish. What am I?

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The answer is

A map

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I travel faster than anything else and help your eyes see. What am I?

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The answer is

Light