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Using mirrors while driving a commercial vehicle is essential for ensuring safe maneuvering and maintaining awareness of the surrounding environment. The correct focus on where the rear of your vehicle is when making turns is crucial, as large vehicles often have significant rear overhangs that can swing wide during turns. This allows the driver to avoid obstacles, curbs, or pedestrians that might be behind the vehicle and ensures the trailer or back of the vehicle clears any hazards while turning.

Monitoring the vehicle's position with mirrors helps in making precise maneuvers, especially in tight or congested spaces, thereby enhancing safety for both the driver and other road users. Recognizing the intended path of the rear of the vehicle can prevent accidents and damage to property.

While checking speed, observing other drivers’ behaviors, and monitoring fuel levels are important aspects of driving, they do not directly relate to the specific use of mirrors in the context of making turns and maintaining spatial awareness of the vehicle's rear. Such actions would typically involve other instruments or direct observation rather than reliance on mirrors.