[SIZE= 10pt][COLOR= black]My mirror also mounts on my glasses. When on my road bike I ride fast. While riding through Kunsan City, South Korea with our group of thirteen riders I consistently outpace all of them. Why? Because I am the only rider in our group who uses a mirror. How does that work? With a congested and the somewhat chaotic (but surprisingly organized) traffic environment within a Korean city my mirror proves to be very useful. Cross traffic, pedestrians crossing without rhyme or reason and many times without warning, city buses, Asian semi-trucks, traffic lights, parked cars, suddenly opening car doors (everywhere), oncoming cars passing others in my lane.... all of these dynamics (and more) all at the same time, and all of the time, demand maximum attention to the frontal area, and yet maximum attention is required from behind as well! My mirror allows me to keep an eye up front with quick and consistent scans behind for overtaking city buses, trucks, cars, and scooters. With a mirror, I am far more able to time traffic in order to weave through, around, and past the dangers of the road without getting wiped out from behind. My ride mates are hampered by having to turn their heads to gauge traffic. The result is they have no choice but to slow down, or crash. Turning ones head (and body really) takes a remarkable amount of time, as compared to effective mirror use. [/COLOR][/SIZE]
[SIZE= 10pt][COLOR= black]IMHO not using a mirror out on the open road isn't that big a deal, but when in heavy/chaotic traffic situations, effective use of a mirror is a valuable asset. [/COLOR][/SIZE]