I am passive-aggressive about it. It makes me nervous to have someone I don't know behind me for many reasons. I don't know if they are waiting to pass so I try to stay over as far as I can which is non-comfy. I don't know if they will respond if I slow or corner slowly and I don't know who they are! So what I do is slow up. If they're going to pass then they'll pass. If they don't, I slow up more. If they still don't pass, I stop pedaling.

I had a toady old guy once get in behind me. He then moved to my side but wouldn't go away. Even after I stopped pedaling, he stayed a bit. Oddly enough, he didn't do that to DH who was riding ahead of me. He did it again later (he must've turned off to go to the bathroom or something). When he finally passed, he said "so we're doing intervals today?" RUDE!

I just think if someone is going to stay close, they should identify themselves. If I have to stay behind someone, say I'm going to be leaving the trail soon and there's no sense in passing, I will let the person know that I'm behind them but will be turning soon. The person usually thanks me for letting them know.