A couple of counter-intuitive thoughts: * The smaller car will stop and maneuver more quickly, avoiding more accidents. * I read a study years ago that said t

A couple of counter-intuitive thoughts: * The smaller car will stop and maneuver more quickly, avoiding more accidents. * I read a study years ago that said the relative sizes and weights of vehicles did not significantly impact the outcomes for the humans inside. Instead, the relative positions of the 'hard-points' did (I forget the term, but the parts that don't crumple on impact). If you rear-end a truck and its rear hard-point goes through your windshield into your head (albeit a personal hard-point), that's bad news. If its hard-point hits your vehicle's hard-point then I imagine you mostly suffer from the sudden stop, at least in modern cars.