Last night in DC they protested around the Convention Center. Three protesters were hit by a car. Police did not press charges against the driver, because witnesses said the he had a green light and and the protestors were trying to close the road.

http://www.wjla.com/articles/2011/11...say-68784.html

I don't think this protest was announced in advance, which would have given motorists a chance to avoid the area. The first time I heard of it was after it had already started, and I keep a close eye on traffic reports.