How can you determine if you are in another vehicle's blind spot?

Determining if you are in another vehicle's blind spot is crucial for safe driving. The correct choice indicates that if you cannot see the driver's face in the rearview mirror of the other vehicle, you are likely in their blind spot. This is because a blind spot is an area around a vehicle that is not visible to the driver through standard mirrors.

If the driver of the other vehicle cannot see you in their rearview mirror, it means that you occupy a space that is out of their line of sight, which could lead to unsafe situations such as merging or changing lanes without the other driver being aware of your presence.

Conditions like seeing the front of the other car in your rearview mirror can signal you might be too close but doesn't necessarily confirm you are in the blind spot. Similarly, being able to see both side mirrors does not guarantee that you are outside of the blind spots, as these mirrors may not cover all blind spot areas, especially for larger vehicles. Therefore, the key determining factor is whether the driver has a clear view of you, which is highlighted by the inability to see the driver's face in their rearview mirror.