In this video http://defensivedriving.com/ spokeswoman Catenya McHenry explains how to adjust your side mirrors to expand your view into your blindspot.
You are driving along, relying on the visibility afforded by nicely adjusted mirrors and that there are no blind spots. It looks safe on the left lane and you signal to shift over, but you crash into a car on the left lane that you did not see. Some accidents happen because of our reliance on what we believe are properly adjusted mirrors with no blind spots. Watch this video on the safe adjustment of your mirrors, providing a visibility that prevents accidents.