RR Terrain Response system
Terrain Response was developed by Land Rover and is now used as a feature on all Land Rover vehicles. Terrain response as the name suggests allows you to change the way the vehicle operates allowing it to travel in various terrains during off road use.
The settings for terrain response are
General Driving - This is the default setting and this setting should be used for on road driving. All systems should work as normal. General driving may also be used for light off road conditions.
Grass, Gravel and Snow - This setting should be used for terrain where the tires will not sink into the ground such as in sand but the surface is slippery or has loose matter. Minimum wheelspin and low accelerator response is the goal of the grass, gravel and snow setting.
Mud and Ruts - This setting should be used on muddy and other slippery surfaces including uneven surfaces.
Sand - The sand setting is self explanatory, it can be used on surfaces where the tires may sink into the ground such as deserts.
Rock Crawl - This setting should be used to trek in areas with larger than gravel size boulders whether on flat ground or on a hill.
There is also a new setting called Dynamic Program which focuses on on-road driving dynamics to provide better handling than the general driving setting.
The various settings are adjusted using a rotary dial on the center console with icons representing the settings. There is also an in dash display showing which setting terrain response is in, the steering angle, whether the differentials are locked or not and other important information.
The components and systems that are altered to facilitate terrain response are the chassis, the suspension, the brakes, the transmission, and the differentials. Other electronic systems used to complete the terrain response feature will be the anti-lock brakes, the traction control, stability control and the hill descent feature.
Some quick examples of the functionality would be that a vehicle will stop easier in sand if the tires are locked so the anti-lock brakes may be reduced or cancelled. The rock crawl will require a locking differential and/or a transfer case while grass gravel and snow may just need proper torque distribution to the wheels.
source - whyhighend.com