As others have said elsewhere, it's the height that's particularly important. As I understand it, there are two reasons: taller vehicles are more likely to send

As others have said elsewhere, it's the height that's particularly important. As I understand it, there are two reasons: taller vehicles are more likely to send pedestrians under the vehicle than over it, and the point of impact is likely to move from the legs (unpleasant but usually survivable) to the trunk (often not).