The off-road mode refers to an extra low-range set of gear ratios, making driving easier on difficult terrain and on very steep gradients. Together with 4XMOTION four-wheel drive in the Touareg, this function enables the car to make good progress over rugged ground. In the Touareg, the low range ratio of 2.66:1 for heavy-duty off-road driving can be electronically activated via the suspension switch. This provides maximum drive force at low speeds. It enables the Touareg to climb slopes of 45 degrees.
Article source: www.volkswagen.co.uk