If a vehicle's windows are covered with ice, what is the appropriate action a driver should take?

The appropriate action a driver should take when a vehicle's windows are covered with ice is to fully clear ice from all windows. This is essential for safety as it ensures maximum visibility while driving. Clear windows allow the driver to see the road, other vehicles, pedestrians, and any potential hazards.

Driving with obstructed windows can significantly increase the risk of accidents, as it can hinder the driver's ability to make safe judgments about speed, distance, and direction. Using a heater to melt the ice can be useful, but it may not clear the ice completely from all windows. Alternatively, driving slowly to clear the ice is not advisable, as even at low speeds, limited visibility can create dangerous situations. Leaving the windows as they are poses the greatest risk, as it completely compromises safety on the road. Thus, fully clearing ice from all windows is the most responsible and safest choice before operating a vehicle.