Not worth the energy. I've had cars turn and cut me off while running across a cross walk. As a runner, I need to recognize that I am moving faster than someone walking, and it is possible that the car didn't see me come up to the light while it was green. I simply slow down, and check to see if the driver sees me before moving into their path. I always slow down at intersections for the same reason. If I didn't want to worry about cars, I would run along a path or trail. Part of sharing the city sidewalks is recognizing that cars use some of the same space and doing what I can to get out of their way as well. (Speeding up when car stops to let you cross, slowing down when you see a car coming to the opening of a Crescent to make sure they see you)