I never know quite how to approach this one. I frequently ride through a couple of spots where I can easily hold 30+ MPH in a 35 or 40 zone, basically they are long downhill stretches. The roads are fairly busy with shoulder activity, pedestrians, side streets, etc., and I don't like having somebody passing me there going 50+ MPH, often they will blast around me and then slam on their brakes as soon as they get back in front of me, they see people milling about close to the travel lanes and realize they need to slow way down. Or they pop out over the double yellow, decide it's unsafe, and try to get back behind me, but I am already slowing down because I see the same hazards, and we get into that awkward side-by-side state where each of us is slowing down at equal rates, expecting the other to overtake.

I've taken to just riding a lot slower, so if somebody does pass they overtake and gap me very quickly, and there is more margin for error if something pops out into the travel lane. But that's gotta be infuriating to drivers who decide to just stay behind me for the whole way.