Hmm Maybe these were some aftermarket thing that I saw but I am sure I have seen them more than once on a couple newer Range Rovers I have seen over here. That or its a North American thing for the 'Rover
Off topic a bit. Most North American vehicles I see now are going to separate lamps for turn signals and brake lights. Weather they are " red and red" or "amber and red" they are separate lamps.
Norcal: Turn signals must be the same as the posted speed limit is around here " JUST A SUGGESTION" LOL
A.D