its the speed limiter or cruise control indicator light.
its lights up to indicate that the limiter function/cruising function is in operation.,
stored speed information appears on the instrument panel display for 30 seconds or perminently, depending on vehicle type.
The amber light is the emissions light. They come on just for fun and go out just as randomly. I wouldn't bother with asking the dealer because they wont know, and it will go out in exactly 3 days anyway.