When a vehicle is stationary, the engine continues to consume fuel and emit pollutants without delivering any benefits at all. This is where the Start-Stop system comes in, automatically switching the engine off when the car is at standstill, thereby instantly reducing fuel consumption.
The system does not require any input from the driver and does not inhibit driving comfort because there is no delay or juddering when the time comes to move off again. The Start-Stop system is activated automatically after the engine starts.