voip-ninja
Give me some sugar baby
You're over thinking this... The simplest approach is just not to hit things:
1) Don't hit things
2) Don't drive in a manner which reduces the system's ability to not hit things (e.g. staying beside other vehicles, out driving sensor range/response, not keeping appropriate following distance, etc.)
3) If a situation is encountered which defeats core defensive driving, see #1
3a) If no escape route exists which satisfies #1, brake as quickly and hard as possible to minimize the kinetic energy of a collision.
An autonomous system will be able to assess the situation and react much faster than a human... so, even if the solution reached is just to burn off energy, you'd still end up with a much lower energy collision than a human driver.
You realize that the video in the OP demonstrates the kind of scenario where "don't hit things" just doesn't work? Sometimes things try to hit you.