Final answer:
When you see a road sign alerting to possible hazards ahead, you should slow down and watch for other signs or signals that may follow.
Step-by-step explanation:
When you see a road sign alerting to possible hazards ahead, the correct action is to slow down and watch for other signs or signals that may follow. This is because the sign is indicating that there may be something that could pose a danger or require you to make a change in your driving. By slowing down and remaining alert, you can better respond to any potential hazards that may come up.