Which of the following items must be operational for safety?

A windshield defroster is essential for safety because it plays a crucial role in maintaining visibility during adverse weather conditions, such as rain, snow, or fog. When the windshield becomes fogged up or covered in ice, the driver’s ability to see the road clearly is compromised, potentially leading to accidents.

The windshield defroster works by directing warm air onto the glass, which helps to clear any condensation or frost, ensuring that the driver has an unobstructed view. Unlike the other options, which do not directly impact the fundamental operating safety of the vehicle, the defroster is a required feature for safe driving conditions, especially in a state like Maryland, where winter weather can be a significant concern.

Power windows, leather upholstery, and a sunroof, while they may enhance comfort and convenience, are not vital for the operational safety of the vehicle in the same way that a functioning windshield defroster is.