What is crucial to do with an extension ladder before using it?

Engaging the ladder locks before using an extension ladder is crucial for ensuring safety during operation. These locks help secure the ladder's sections and prevent accidental collapse while you are climbing or using the ladder at various heights. When the locks are engaged properly, they create a stable and secure structure, which reduces the risk of the ladder shifting or collapsing unexpectedly, leading to potential falls or injuries.

While other actions like stabilizing the ladder, checking the weather, and inspecting the ground beneath the ladder are also important safety measures, they serve different purposes. Stabilizing with a rope can help in windy conditions, inspecting the ground can ensure a solid foundation, and checking the weather can prevent accidents due to adverse conditions. However, without engaging the ladder locks, the primary safety feature of the ladder is compromised, which is why this step is essential before any use.