A cyclist sent me a link to a video of them being ticketed for running a stop sign at East Potomac Park and was criticized for failing to signal a turn. This was at night when the Hains Point loop was closed, so the only thing the cyclist could do is turn left. He admits to not stopping and not signaling.
My take is that this ticket meets the very minimum requirement, in that it is technically accurate to the law. The cyclist has a good point about how, when the road is closed this isn't really an intersection anymore; and it's hard to see how his behavior was dangerous. Still, there is a stop sign there, and a stop sign doesn't need to be at an intersection to be valid.
I also think this is a terrible use of law enforcement resources. There are real, dangerous things that are being done out there by some cyclists (and drivers) that they could be ticketing instead of this. If ever there was a case where a warning would do, this is probably it.
If it were me, I'd just chalk it up to the one time I got caught compared to the larger-than-one number of times when I got away with it. I'd pay my ticket and consider it the cost of doing business. But it sounds like this guy more closely adheres to the letter of the law than me, he writes "I'm pretty much as non-scofflaw a cyclist as you'll meet. I stop at stop signs and red lights if anybody else is in sight," so that is no comfort to him.