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".
Trek, I agree with you on this point -- you just said it better. The critical piece is that you need to be sure you are riding to the right are far as is safe. The rider that is riding just barely to the right of the moving traffic and oblivious to everything. . . . grrrr. The rider who wants to pass has the responsibility to say "on your left", pick a safe time to pass, and not get a nasty comment from the passee.