Someone put a lot of thought into describing the new animated functionality of the turn signals in the owner’s manual for the updated 2018 Range Rover & Range Rover Sport.  This is kind of a repost but the wording was so thorough I couldn’t resist.

TURN SIGNALS
The animated turn signal feature is in place to improve the turn signal function by a sequential activation of their light sources. This is achieved by switching on consecutive segments of lights from inboard to outboard and during a defined period of time, creating a sweeping effect. Only lights with LED are able to reproduce any dynamic effect.