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

Question

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.

Accepted Answer

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

Answer

Should try guessing.

Answer

Should look at the road closely.