What does the term "blind spot" refer to?

The term "blind spot" specifically refers to areas around your vehicle that cannot be seen using the rearview or side mirrors. These areas typically exist on the left and right sides of the vehicle, often right behind the driver’s line of sight. Drivers need to be aware of their blind spots, particularly when changing lanes or merging, as other vehicles or objects may be present in those areas, making them invisible and increasing the risk of accidents. Proper head checks or the use of additional mirrors can help reduce the dangers associated with blind spots. The other options describe different concepts related to visibility and surroundings but do not specifically define what a blind spot is in the context of driving.