What is a “blind spot”?

1. The distance a driver should keep from other vehicles while driving in reverse.
2. Correct answer: Part of the vehicle's circumference in which the driver cannot see or detect road users.
3. The non-paved area around the vehicle.
4. Part of the vehicle's circumference which the driver can only see through the mirrors.

WhyA blind spot is any area around the vehicle that the driver cannot see, neither directly nor in the mirrors.