When should a driver use the vehicle's rear view mirror?

Using the vehicle's rear view mirror is essential for safe driving, and it's particularly important before changing direction. This action helps the driver to be aware of the traffic behind and alongside the vehicle, ensuring that there is no oncoming traffic or other hazards that could pose a danger while maneuvering.

Checking the rear view mirror before changing direction allows the driver to make informed decisions about when it is safe to turn or change lanes. It promotes better situational awareness and reduces the likelihood of accidents. This practice is a fundamental aspect of defensive driving and is essential to ensure the safety of all road users.

While the other options suggest when the rear view mirror might be used, they do not encompass the broader context of overall safety and awareness required when changing direction. For example, only checking it when parking or when reversing does not account for the dynamic nature of the road and other moving vehicles. Additionally, approaching a junction requires a more comprehensive assessment that includes not just the rear view but also side mirrors and potentially looking directly to ensure all is clear.