I put this mirror adjustment to very good use early on after learning about it. I did avoid an accident on the Garden State Parkway in NJ. I am convinced if I had to take that extra second to crane my neck around to see if I could safely move out of my lane, I would have been hit. The quick response time it took for me to glance in both mirrors to assure me I was safe to move out of the lane prevented a sure fire accident.
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