[soperj]

Almost like we need a study to figure out what the actual cause is. Oh, that's what the article is about, the study.

[ericpauley]

Per tfa vehicle size “ represents about 10 percent of the recent increase in pedestrian deaths” so the title is really a distraction from the (likely) root cause that GP brings up.

[estebank]

Could it be that the other differences are driven by differences in the built environment? Like narrower roads making people drive slower, or bollards, or alternatives to driving making it less likely to have people that shouldn't be driving doing so?

Also, 10% is a huge effect.