I've wondered about the etiquette for these kinds of tracks. Since getting my bike a few months ago I've done a few very, very easy/simple tracks in my area. Nothing fancy, but slightly downhill, some small jumps, bumps, rocks, bridges, turns, etc. Anyway, like you said, they're designed to be done at a certain speed so I feel like a dick the first time I do them cause I tend to go slower than I probably should. I'm always worried that someone's going to come speeding up behind me. Obviously it's not a big deal on this easy stuff, but it might be an issue once I start graduating to steeper, faster ones. Is it generally expected that you'll go behind someone who knows the layout so you won't be a slow ass?