Later this year Citroen will unveil the "Citron C3 Stop and Start" , a car equipped with a system that cuts the engine when the car is stopped and idling (at red lights, for deliveries, in traffic jams, etc.), then instantly restarts it at the touch of the accelerator. The innovation will be linked to the SensoDrive electronically controlled manual gearbox. Citroen says the "Stop and Start" system is expected to reduce fuel consumption by about ten per cent for urban driving and by six per cent in the standard combined cycle.