Because US drivers don't know the proper use of side view mirrors! more...
Usually most US drivers use the side view mirrors to view the sides of their cars. What good is that? The way I use them is to see the blind spot on the side of the car. Do this, track a car coming from behind with the rear view mirror (the one inside the car) then adjust the side view mirrors to see the car beside you. I usually have them fixed just beyond my peripheral vision. I think Dan C. wrote a good article a while back on it, and I know there was an article in the Star about it.
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