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Question:

If unable to tell if the road is becoming icy and slippery, a driver:

A May open their window and feel the front of the side mirror for ice.
Explaination

If you think the road surface may be becoming icy but you are not certain, you can open your window and feel the front of the side mirror, mirror support, or antenna. If ice has formed on any of these items, the road is likely becoming icy as well.