The disparity in vehicle size is a major concern on America’s roads, particularly as passenger cars trend bigger and heavier, with electrified models pushing curb weights up even further. It’s expressed in the number of deaths per million registered vehicle years—not to drivers in that car, but to whoever they collide with. The study incorporates data from 2021 through 2024, and mostly concerns 2023 model-year vehicles. Unsurprisingly, heavy-duty trucks and muscle cars dominate the top of this list. The Kia Rio and Nissan Versa far and away lead the running, with death rates of 170 and 164 per million registered years, respectively.