Rear Collision Warning (RCW) Default setting RoW vs US.

[Power6]

What I've seen is US cars generally have the Rear Collision Mitigation only. I had it activate once, so I understand it still warns the driver! But without the "warning" it doesn't warn externally on the car, i.e. flash the hazards.

Generally EU cars seem to have Rear Collision Warning & Mitigation set.