What should be done to maintain control while driving down a steep hill in icy conditions?

Maintaining control while driving down a steep hill in icy conditions is crucial for safety, and using a lower gear while braking gently is the most effective strategy. When you select a lower gear, the engine can help slow the vehicle through engine braking. This reduces the dependence on the brakes, which can easily lock up or cause the car to skid on icy surfaces. By braking gently, you minimize the risk of losing traction; sudden or heavy braking can lead to skidding.

In icy conditions, it's essential to manage speed and momentum carefully. Keeping your speed in check allows for more control over the vehicle, reducing the likelihood of skidding. Other options, such as accelerating, would increase speed and jeopardize control, while steering sharply can lead to a loss of traction. Maintaining a constant speed does not address the need to control momentum effectively on the hill and could lead to dangerous situations if the vehicle begins to slide.