“IIHS researchers analyzed pedestrian crashes to develop injury risk curves showing how speed affects crash outcomes. They found that the effect of crash speed on injury risk was magnified for vehicles with taller front ends. Compared with risk curves developed using crash data from Europe, where tall passenger vehicles are less common, risk curves for the U.S. show pedestrians here begin to suffer more serious injuries at lower speeds.“ https://www.iihs.org/news/detail/vehicle-height-compounds-dangers-of-speed-for-pedestrians
If you've not been to the US in the last five years, the overall size, and particularly the height of the average vehicle here, has grown dramatically. Meanwhile our infrastructure and road design policy has barely changed from fifty years ago.