Why is it critical for drivers to perform blind spot checks prior to changing lanes?

Performing blind spot checks before changing lanes is essential because it addresses the limitations of rearview and side mirrors. While these mirrors provide a wide view of the roadway, they cannot capture everything, particularly in the blind spots located just behind each rear quarter panel of the vehicle. These areas are hidden from mirror view and can potentially conceal other vehicles or obstacles. By physically turning their head to check blind spots, drivers can ensure that their intended lane is clear of any other vehicles or hazards that may not be visible through mirrors alone. This proactive measure significantly enhances safety and reduces the risk of collisions during lane changes.