When loading or unloading hazardous materials, which procedure should be followed?

Setting the parking brakes and chocking the wheels is crucial when loading or unloading hazardous materials to ensure the vehicle remains stable and does not roll away. This procedure helps prevent accidents or spills that could occur if the vehicle were to move unexpectedly.

Using the parking brakes alone may not provide sufficient security, especially on uneven surfaces. Chocking the wheels creates an additional safety barrier against movement, which is particularly important when handling materials that pose a risk to safety or the environment. Following this practice aligns with safety regulations and best practices for managing hazardous materials effectively.

The other procedures suggested do not prioritize safety while handling hazardous materials. For example, leaving the vehicle running could lead to a hazardous situation with emissions or the risk of acceleration. Allowing cargo to be unattended can increase the risk of tampering or accidents. Parking on an incline without securing the vehicle poses a significant safety threat, as it could result in the vehicle rolling, causing spills and other dangerous consequences.