The mirrors do block your view, that is why the below eyeline mirrors became popular in the late 70's to early 80's. Now the manufacturers use large passenger car type mirrors and not TRUCK mirrors.
They catch a LOT of air.
But . . that mirror frame is ideal to hang the left hand upon while cruising in order to "air out" (inflate) your shirt. Old timey air-conditioning. Handy way to wave at all and sundry, too.
(And, more importantly, one can attach convex mirrors as we do on big trucks to: show the roofline of the trailer, and to eliminate blind spots for moving to the right lane. A reflector or two -- amber forward -- and a lighted turn signal to let 'em know your a'comin', shoot, you'll be West Virginny in no time).
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