According to Roadcraft, when should you check your mirrors?

The requirement to check your mirrors at appropriate times during the use of the system is grounded in the principles of safe driving and situational awareness. Drivers need to be conscious of their surroundings and the behavior of other road users at all times. This means regularly checking mirrors to monitor traffic conditions, anticipate hazards, and maintain a clear understanding of the space around the vehicle.

This approach supports proactive driving, where the driver can respond effectively to changes in the environment, such as vehicles merging into your lane, cyclists appearing alongside, or pedestrians crossing. Regularly checking mirrors provides vital information that can assist in decision-making, enhancing overall safety.

While it might seem practical to consider other options, like checking mirrors only during a specific action like lane changes, or after starting the journey, these do not foster the continuous awareness needed on the road. Driving requires constant attention to dynamic conditions, making the strategy of checking mirrors whenever necessary far more effective for ensuring safety.