> The difference of speed between cars is what causes accidents. A cause, but most definitely not the cause. There's the not-so-trivial factors of reaction tim

> The difference of speed between cars is what causes accidents. A cause, but most definitely not the cause. There's the not-so-trivial factors of reaction time (separation / speed) and breaking distance (proportional to the square of the speed) too. And many other factors too, of course.