There's a stretch of country two-lane with no shoulder on my commute... a short stretch, less than a mile.... but most of it is marked with double yellow, especially the part leading into the blind curve at the end. Cars routinely cross the double yellow pass me, even on that curve. I recognize that I'm not gonna stop them but I try to maintain enough lane position that they have to really move over to the left to get around me and.... if need be I have a little wiggle room to veer right if they have to cut back in suddenly. I generally take the middle of the lane or so. If they are behind me and I can see no on-coming traffic, I'll shift right a bit (into the right tire track) to invite them to pass. If there is oncoming traffic I try to hold my position. I even once flagged a car down that started to pass because there was oncoming traffic and if he had tried to pull around me he would have gotten in a collision. When the other traffic cleared I moved right and waved him around... and when he came by he gave me a thumbs up.

In that stretch I don't worry about double yellow versus dashed yellow; if a car wants to pass they pretty much ignore it. I just try to make things as safe as I can for all involved. It's what Keri on CommuteOrlando calls "leading the dance."