iOnRoad is a free augmented reality driving safety app.[1] It received the International CES 2012 innovation award.[2][3][4]The program uses the GPS feature, gyroscope and video camera stream of the native mobile device to monitor a vehicle’s position on the road, alerting drivers of lane departures and potential collisions with audio and visual cues.[5][6]iOnRoad has been downloaded by over 500,000 people (from wikipedia).
Android: https://play.google.com/store/apps/details?id=com.picitup.iOnRoad.pro