In insurance they call it the "law of lugnuts" - bigger cars have better survivability in direct collisions. However, most traffic fatalities do not come from

In insurance they call it the "law of lugnuts" - bigger cars have better survivability in direct collisions. However, most traffic fatalities do not come from direct collisions. They come from driver hitting immobile objects. Smaller, lighter cars take less kinetic energy with them around corners, are easier to steer and avoid obstacles, and are more likely to stay upright when leaving the road.