What else should be done before starting a large vehicle besides observing the rearview mirrors?

[LaClayton]

Before starting a large vehicle, besides observing the rearview mirrors, you should also check the front lower mirrors. Below are specific instructions regarding starting a large vehicle: Precautions: Listen carefully to the sound of the accelerator. When starting the vehicle, there are three distinct sounds during the clutch release: "high-pitched," "steady," and "low-pitched." The "high-pitched" sound indicates the free travel distance of the clutch, while during the "steady" and "low-pitched" sounds, the speed of releasing the clutch must be slowed down. Additional information: Techniques: For starting on flat roads or downhill, you can release the handbrake first, then press the accelerator and release the clutch. However, for uphill starts, you should only release the handbrake when the accelerator sound changes to "steady," otherwise, the vehicle may roll backward. On flat roads and downhill starts, a slight press on the accelerator is sufficient, while uphill starts require adjusting the accelerator pressure according to the slope's steepness—the steeper the slope, the greater the pressure needed.