Which statement about mirrors is true?

The statement that all trucks have blind spots which mirrors cannot cover is correct because, despite the presence of mirrors, there are certain areas around a truck that remain outside the driver’s view. These blind spots, often referred to as "no-zones," can be extensive due to the size and shape of large trucks. This is particularly important for drivers to understand, as they must rely not only on their mirrors but also on awareness of these blind spots to ensure safety while driving.

Mirrors may help reduce blind spots by providing visibility of areas behind and beside the vehicle, but they cannot completely eliminate the risk of blind spots, especially when it comes to the areas directly behind and directly next to the vehicle. This makes awareness of the limitations of mirrors crucial for truck drivers to avoid accidents during maneuvers such as turning, changing lanes, or backing up.

In contrast, mirrors do not eliminate all blind spots, suggesting that they have a limited capability. Additionally, mirrors are essential for vehicles of all sizes, not just those over 20 feet, and they are useful both day and night for safe driving practices.