Which of the following is a safety precaution when loading materials?

Ensuring the load is evenly distributed is a critical safety precaution when loading materials. An improperly loaded vehicle can lead to instability during transport, increasing the risk of tipping over, particularly on uneven surfaces or during turns. When the weight is evenly spread, it helps maintain balance and control, which is essential for safe operation. This practice is foundational in hoisting and material handling, as it directly impacts the safety of the operation, minimizing the risk of accidents and potential injuries to the operator and others nearby.

The other options involve practices that could compromise safety. For instance, loading quickly can lead to careless mistakes, unbalanced loads, or injuries if proper protocols are not followed. Loading from the rear of the vehicle might not be safe or feasible depending on the situation or vehicle design, and only loading heavy materials can lead to potential overloading and difficulty in handling. All these practices contradict the principles of safety and efficiency in material handling, making even load distribution crucial.