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The statistical reasoning in the analysis of pedestrian collisions seems faulty to me. Yes, they happen most often in crosswalks when the pedestrian has the signal, but that's also probably the most common way for pedestrians to cross the street. Non-crosswalk collisions are ~21% of all collisions, but if non-crosswalk crossings were only, say, 15% of total street-crossings (regardless of whether they resulted in collisions), non-crosswalk crossing would be over-represented in collisions, and might then actually be more likely to result in a collision than with-signal crosswalk crossing. This analysis doesn't actually provide any guidance, as far as I can tell, about the relative risk of different ways of crossing the street.

by Andrew Pendleton on Jun 14, 2012 11:17 am • link • report