I'm under the impression that the green pedal symbol comes on when the car thinks you can come off the gas and it will coast up to a junction without issue.
I get a squiggly parallel line symbol when the cruise is backing off to keep the car stable round the twisty bits. Very clever and don't know if it uses the cameras, the GPS maps or both to make the decisions.
It's easy for the car to make driving numb but it is safe.
My other car doesn't have traction control, ABS or power steering so I use this to have fun and let the S6 oil burner eat miles in comfort, albeit with the ability to deal with the majority of the people that think there car is an F1 car and think they can drive🙃