You should not change lanes unless it is safe to do so. The car should let off the gas, put on hazards and try to move to the side of the road. I am with the other engineers, the trolley problem does not apply here. Why waste effort deciding who lives and who dies when more time can be spent figuring out how to handle these situations safely?

Sure, that still works as a purely abstract problem.

But when it comes to self-driving cars, the answer is that it doesn't really matter.