The DC police don't make estimates of protest crowds. Sometimes they mention estimates made by the protest groups and the protest groups distort that as a confirmation. No government organization makes estimates of the crowds anymore because the protest organizations made too much trouble over them and the government doesn't want to be in the crowd estimate business.

I have been at all the marches. There have never been 100,000 at any of them for the reasons cited in my post. The arithmetic is pretty simple and devastating to the inflated estimates. The biggest ones top out at about 50,000, which is quite a large crowd. The organizers then inflate the actual numbers ten times.

The arithmetic to determine how many people can march by any spot in three hours is very simple. To get 100,000 down a road in three hours is impossible, even at a sprint. When the Union Army marched down Pennsylvania Avenue at the end of the Civil War, it took them two twelve hour days to push 100,000 disciplined marchers past the White House.