Dismount Bike Ahead by M.V. Jantzen
He adds "Cyclists on the Mt Vernon Trail, by National Airport. The crosswalk by a road connecting to the Mt Vernon Parkway has long had a stop sign and another sign saying "dismount before crossing," which I find ridiculous. Dismount??? So, I was shocked to see a pair of new signs added a few yards before the existing signs, saying "dismount bike ahead." .... Notice there are no signs for automobile traffic, even though the painted crosswalk means they have a requirement to yield, not the other way around. Arlington, VA."
I like how the new one is about the dismount ahead, like the reason why people weren't complying is that they were caught off guard by it.