Ontario Class A Practice Test · Question
When transporting materials labelled as 'Dangerous When Wet', what is the most critical precaution a driver must take?
Materials labelled 'Dangerous When Wet' (Class 4.3) react with water to produce flammable or toxic gases. Therefore, the most critical precaution is to keep the
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Question: When transporting materials labelled as 'Dangerous When Wet', what is the most critical precaution a driver must take?
Answer options:
- Ensure the cargo is kept at a constant warm temperature. ✅ Verify the cargo is stored in a dry, waterproof environment and protected from moisture.
- Dilute the substance with water if it starts to heat up.
- Ensure the truck's air conditioning is fully operational.
Correct answer: Verify the cargo is stored in a dry, waterproof environment and protected from moisture.
Explanation: Materials labelled 'Dangerous When Wet' (Class 4.3) react with water to produce flammable or toxic gases. Therefore, the most critical precaution is to keep them absolutely dry and protected from all sources of moisture.
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