I don't mind being DINGed at, as long as you don't do it for the first time 3 feet behind me. The other day a guy in full kit and at full tilt on the MUT didn't say on your left until he was right at my back tire. Of course, I didn't hear him coming at all because he was coming so fast, and I jumped out of my skin.

If you're going to warn people, make some noise way back so they're not startled. I try to whistle a little tune about 20 yards away (our trails are not very crowded) so they at least know someone is back there and approaching. Then people don't startle when you get closer.

Karen