Dictionary.com defines a head-up display as an electronic reproduction of instrument data projected at eye level so a driver or pilot sees it without looking away from the road or their course of travel. Originally developed for the aviation industry, these devices are increasingly being incorporated into automobiles. Sedans with head-up displays offer drivers information about various functions of the car without unduly distracting their attention from the road. Used primarily to convey road speed and engine speed, the displays also relay navigation information in addition to data about other performance parameters of the car. Primarily found only in more expensive performance-oriented models, head-up displays are slowly finding their way into more mainstream automobiles.