When changing a tire, why should you secure the vehicle with blocks?

Securing the vehicle with blocks when changing a tire is crucial to prevent it from rolling. Without proper stabilization, there is a risk that the vehicle could move unexpectedly, which could lead to serious injury. By placing wheel chocks or blocks behind or in front of the tires on the opposite side of the vehicle being lifted, you create a barrier that keeps the vehicle stationary.

This safety measure is particularly important because when a car is lifted on a jack, it becomes unstable, especially if it's on an incline or uneven surface. Ensuring that the vehicle does not move can protect both the individual changing the tire and others nearby, making it a fundamental aspect of safe tire changing practices.