The electronic stabilisation programme uses a sensor to measure the lateral acceleration acting on the car in order to calculate its actual position. The lateral acceleration sensor is located in the same housing as the rotation (Yaw) rate sensor (duo-sensor). Lateral acceleration acts on a car sideways to the direction of travel. It is noticeable as a centrifugal force moving a car to the outside of a curve when cornering, for example.

Article source: www.volkswagen.co.uk