Quote Originally Posted by Trek420

If someone behind calls, "On your left!", you should move right immediately when possible. Believe it or not, I've seen people on group rides, where they had signed a form saying they were experienced riders, swerve left into the path of the passing rider.

I slightly dissagree with this. I feel it's my responsibiblity to find a line that is safe, as far to the right as is safe to do also being aware of obsticals on the road etc. Having a knee-jerk reaction of moving to the right each call out may put me in harms way. I get passed...a lot so I've learned to be as far to the right as is safe but if you're passing me it is your responsibility to call out and then pass when it is safe for you to do. It's not my responsibility to move to the right, I should already be there. Especialy on descents altering my angle on a turn could be dangerous. So "on your left" does not mean "I move right".
To me, "On Your Left" means "Keep Your Line (because I'm gonna pass you, and don't want to scare you in to swerving like crazy just 'cause another bike's nearby)"

~ beanie