So: 1. At intersections with "leading pedestrian intervals" or "exclusive pedestrian phasing," walk signals provide unique safety benefits that reduce the risk

So: 1. At intersections with "leading pedestrian intervals" or "exclusive pedestrian phasing," walk signals provide unique safety benefits that reduce the risks posed by oncoming traffic. 2. This can be important: due to road geometry or other obstructions, it can be hard to see oncoming traffic from a distance, especially for the visually impaired. 3. Blind pedestrians can hear audible walk signals, but cannot see oncoming traffic at all. 4. At sufficiently complex intersections, it can be impossible for you to tell whether stopped cars are about to come towards you when a light changes. 5. Most importantly: walk signs usually tell you how soon a light will change, so that you don't start walking just before a light change. This is why walk signals reduce car-related fatalities, particularly at night, when people are most at risk.