|Data-based planning isn't going to help these folks get|
across the street.
When you ask people about their experiences walking, you often hear horror stories of drivers who don't yield to pedestrians, a lack of sidewalks and sidewalks too close to speeding traffic, among other things. Because we, to some degree, lack the metrics to define and measure those complaints, the problems basically don't exist. This makes it difficult to design transportation systems that address these issues.
CityLab has lots more and it's interesting reading. Check out the entire article at the link above.