My guess is that on a per distance basis, walking is more dangerous because of pedestrian-car collisions (aka getting run over). I think part of the dissonance

My guess is that on a per distance basis, walking is more dangerous because of pedestrian-car collisions (aka getting run over). I think part of the dissonance is that intuitively I tend to compare on a time basis. I guess it depends on whether one is traveling to a destination (constant distance) or traveling for recreation (constant time).