This all sounds highly practical – except for the fact that German law forbids people from operating their cellphones while driving a car. Legally speaking, apps like Route-n-Fuel cannot be used by the driver. And stopping often to check the display is of course out of the question. Inventive minds from across the globe however have come up with a solution – augmented reality (AR), i.e. the use of digital technology to widen our perception of reality. In the automotive scenario this means using a "head-up display", one which projects the relevant information onto the windshield. Among other carmakers, BMW is offering this feature in its latest 3 series and Mercedes in its C series cars.