What is the proper technique for checking blind spots?

The proper technique for checking blind spots involves using both physical checks and mirrors, making the option of looking over your shoulder along with using mirrors the best practice. This combination ensures a more comprehensive view of the surrounding area that mirrors alone cannot provide, particularly in the blind spots that are not visible in your rearview or side mirrors.

When you lean slightly or turn your head to look over your shoulder, you can see areas that are not visible in your mirrors. This is especially important when changing lanes or making turns in larger vehicles, where blind spots can extend significantly beyond the immediate view from the mirrors. Thus, using both techniques helps improve the safety of merging and changing lanes, reducing the risk of accidents caused by unseen vehicles or obstacles.