I wish I bookmarked the source, but it's a collective action problem. Bigger vehicles are safer for their occupants than smaller cars, but for every life save

I wish I bookmarked the source, but it's a collective action problem. Bigger vehicles are safer for their occupants than smaller cars, but for every life saved by bigger cars, 12 pedestrian/cyclist/small car occupant's lives are loss. The only practical way to solve collective action problems is through government regulation, and government regulations do not take into account bystander lives.