I see. I would also consider an aborted lane change doing nothing. However, I wouldn’t try to jerk back into my lane if a car was approaching me with that kind of differential since a) they don’t have time to react and may have been planning to go into my origin lane, for all I know, and b) by the time such a fast car is spotted, they would likely pass my car too quickly for any lateral movement to leave their trajectory.
Your other examples would be happening in front of the car.
> I would also consider an aborted lane change doing nothing.
Aborting a lane change before you initiate it is changing your behavior, in response to a danger.
> Your other examples would be happening in front of the car.
Or from the side.
Or from behind, again. If I'm in stop-and-go, danger can come from behind. Picture an ambulance coming up from behind. You absolutely should change your behavior, depending on conditions all around you. Not just the front.
Your other examples would be happening in front of the car.