See also:

Remove attached partsfollowing use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

HDC Hill Descent Control
The concept HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. Without applying the brakes, the vehicle moves at slightly more than walking ...

The concept
This system projects important information into the driver's field of vision, e.g., the speed. In this way, the driver can get information without averting his or her eyes from the road. ...