The electrohydraulic power steering builds on the hydraulic power steering system. In electrohydraulic power steering, the pump that generates the pressure required for power assistance is driven by an electric motor. Its operation is matched to the level of power assistance required, so when you are parking, for example, the hydraulic pump's delivery rate is increased to give you more steering help. At high speeds, the pump speed is reduced as you don't need as much assistance. The advantages of the electrohydraulic power steering lie in the added convenience it offers in the form of light-action steering when manoeuvring and much firmer steering when driving at high speeds. Additionally, it saves fuel by only consuming energy when necessary.