The kinetic energy of a moving object is proportional to its velocity squared. A collision at 30mph is vastly more survivable than at 45mph. Even if someone ju

The kinetic energy of a moving object is proportional to its velocity squared. A collision at 30mph is vastly more survivable than at 45mph. Even if someone jumps out in front of you with no warning (which is uncommon), as long as you're paying enough attention to apply the brakes, whatever amount of braking you can do is much better than nothing. Trying to prevent accidents isn't mutually exclusive with minimizing the impact of accidents that do occur.