These displays are appropriately superimposed on the real outside world and dynamically displayed. For example, when the vehicle approaches an intersection where the navigation route says it should turn, the driver sees two indications: first, an advance notice on the road surface, followed by three arrows located at the intersection. The closer the driver gets to the intersection, the larger the arrows become, and at the same time their textures fade to keep the view of the road clear. In developing the system, Volkswagen says it has placed great emphasis on sparing display: The driver should in no way be inundated with stimuli.
The Lane Assist function is also visualised in the long-range window: If the vehicle approaches a boundary line at the edge of the lane without flashing, this is displayed in orange. When Travel Assist is switched on, which guides the car in the middle of the lane, two green lines appear. During a subsequent journey, the display marks the vehicle in front with a coloured stripe, provided ACC distance control or Travel Assist is active. When the assistance systems are switched off, the driver sees a red warning signal if he is tailgating so closely that a critical situation arises.
More information: https://www.volkswagen-newsroom.com/en