BMW 5 Series: The concept - Automatic Engine Start/Stop 
Function - Driving - Controls - BMW 5 Series Owners ManualsBMW 5 Series: The concept

The automatic engine start-stop function helps save fuel. The system switches off the engine during a stop, e. g., in a traffic congestion or at traffic lights. The ignition remains switched on.

The engine starts again automatically for driving off.

    Automatic mode
    The automatic engine start/stop function is operational after each engine start. The function is activated above a certain speed. ▷ Manual transmission: above 3 mph, approx. 5 km/h. ▷ ...

    See also:

    Trunk Release
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    Entertainment
    The chapter helps assure your enjoyment when receiving radio and television stations and playing CDs, DVDs and tracks from the music collection. ...

    Headlights
    Replacing the xenon headlight bulb (if so equipped) HIGH VOLTAGE: When xenon headlights are on, they produce a high voltage. To prevent an electric shock, never attempt to modify or disassemble. ...