However, the windscreen has not only become larger and more stable. In terms of function, too, it is now extremely important. Fitted with infrared or rain sensors, tinted in various shades or coated to provide sound or heat insulation, the windscreen has in the meantime become a high-tech product with a multitude of useful features. Development of the Head-Up Display was equivalent to a quantum leap. This is a technology on which several car makers are working in parallel and one which BMW introduced as a standard feature in the BMW 5 Series in 2003, becoming the first European car manufacturer to do so. The Head-Up Display projects important information that is relevant to the driver onto the windscreen and thus directly into the driver’s field of vision – in colour and, depending on the incident light, in varying degrees of brightness. It is an optical system that had hitherto been reserved for jet pilots.