I have noticed recently that more and more people are plugged into their iphones/mp3 players. I am not just talking about commuters, but also people fully kitted out. Headphones looped through helmets, etc. You can't hear other riders, are distracted, and are a danger to yourself and other riders. I almost crashed when I tried to pass someone on a climb after shouting "on your left", and the rider didn't hear me, and then started to slide to the left. If you are going to be plugged in, stay on the trainer at home.
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http://www.savagesentiments.blogspot.com/
http://www.tricoachmartin.com/
https://www.facebook.com/teameverymanjack