Sometimes an advisory speed sign is used with a warning sign. For example, to show the maximum speed that’s safe in good conditions, or how long you should look out for a particular hazard.

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Warning signs alert you that there may be dangers or changed road conditions ahead. The signs are usually diamond-shaped with pictures, diagrams, symbols or words in black on a yellow background.

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Watch out for these common warning signs when you're driving. These alert you to possible dangers and changed conditions.

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Some roads have large electronic signs (called variable message signs). These signs warn you of changes in traffic conditions ahead – for example, fog, a crash, roadworks, congestion, road closures or police operations.

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