Currently, vehicle navigation systems involve looking at a tiny map, and following a little triangle on a screen. Rather than this, look out your windshield and drive normally. A green line or arrow is superimposed onto the road or highway showing you where to go. It's as if a stripe has been painted on the road leading you to your destination. How is this done? GPS, mapping software, eye-tracking (or simpler, a start-of-trip calibration)... The same technology could be used to display virtual signs above the road or virtual speed markers on the side of the road.

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