Pedestrians have the right of way in all marked crosswalks even if there is no traffic light, you should be slowing down as you approach crosswalks without traffic lights as well. As a driver, you should always assume that there are pedestrians waiting to cross even if you cannot immediately see them. The worst that can happen to you by doing this is that you are slightly delayed. The worst that can happen to a pedestrian when cars are not properly yielding at crosswalks is that they are seriously injured or die.

Obviously, pedestrians should not expect cars to slow down for them if there is a "don't walk" traffic light.