First, things that are obvious aren't always correct. It's better to rely on actual data than intuition alone. Second, the study not only gives the qualitative

First, things that are obvious aren't always correct. It's better to rely on actual data than intuition alone. Second, the study not only gives the qualitative result that higher hoods are more dangerous, but also begins to quantify the effect, and can give an idea of the specific height at which the pedestrian danger begins to spike.