What should a driver do to adjust the defroster effectively?

Using both hands on the steering wheel at all times is crucial for maintaining control of the vehicle. When adjusting features like the defroster, it's important to ensure that the driver remains focused on the road and has full control over steering. Keeping both hands on the wheel minimizes the risk of losing control, especially if a sudden need to maneuver arises.

Additionally, adjusting the defroster helps ensure clear visibility by directing airflow effectively across the windshield and windows, which is essential for safe driving. If a driver were to remove a hand from the wheel to make an adjustment, it could lead to a distraction and potentially hazardous situation, particularly in challenging driving conditions or at higher speeds. Thus, maintaining a proper grip on the steering wheel while managing in-car adjustments contributes significantly to overall safety.