I only use one earbud if I'm anywhere even vaguely busy, cycling or running. It's just common sense really, but, you know...
Runner was killed near me, running with headphones, stepped off pavement to avoid someone, bus hit him from behind. Sadly killed. Narrow stretch of main road with small pavement, I always cycle on pavement on this stretch just not worth the risk.
I know a cyclist who wears headphones cycling, I ve told her loads of times not to.
I don't see an issue riding or running with earphones in, so long as the person accepts that they cannot hear the outside world and has to take account of this in their actions. You can't just step out into the road without looking, you can't hog the middle of the path, you can't jump out of your skin and throw a strop if there's a close pass that takes you by surprise.
On a related note, has anyone else noticed more drivers wearing earphones/headphones?
