I know it’s sarcastic, but that is true universally and thus wouldn’t explain a local trend that deviates from the trends on a broader scale.

That said, I believe there was a study recently that looked at the trend in pedestrian/car fatalities, compared that to the percentage of vehicles on the road classified as trucks, and the relative size and mass of trucks over the years and found some striking correlations. I’ll see if I can dig up the study.