For (~100kg) pedestrian, I am sure the difference in lethality from being hit by a 1000kg vehicle vs a 3000kg vehicle is insubstantial. Where the weight would matter is for vehicle-vehicle collisions.
The vast majority of pedestrians survive getting hit by a car, not all incidents happen at highway speeds. A difference between a mass of 1 and 3 tons would absolutely make a difference in lethality.
Dubious claim. A vehicle might as well be a wall with infinite mass vs a pedestrian. Deformation, breaking and being passed out of the way are what counts.
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