The wife made phone calls and actually found a responsive person. Turns out, it's weekdays to fix a sewer problem at 911 M. Shoould only take a few days. Those restriction signs are done by the various contractors who need to use them. Someone in DC government hands them a batch of blank forms and waves bye-bye. Then the contractor fills them in, usually reasonably. Under normal circumstances, they are supposed to go up three days (is that really "business" days) before the take effect. "Normal" is probably 60% of the time, what with the contractor's team having lots of other things to worry about. And the DC ticket writers don't care if the posters are put up that day, for that day. They just write a ticket. It's usually reversible, but with some hassle.
Back to the present: However, not enough people moved their cars. So the workers couldn't get their equipment in position to do the work. So Monday was lost. Same for Tuesday. This is Friday, and they're still trying to get it done. Don't know if they will till next week..
What makes it extra fun for the neighborhood are the street cleaning restrictions. Then blocking off one side of a block really makes life difficult, since there is essentially no parking for several hours on a full half-block. Either side. Since parking around here at capacity most of the time anyway, nuking a whole half block really hurts.