GPR is radically accelerating the arrival of self-driving vehicles by tackling some of the most challenging problems that stand in the way of safe and reliable navigation. Every road in the world has a unique subsurface signature. GPR uses radar to create a map of those subsurface signatures from which self-driving cars and other automated vehicles can navigate. Vehicles using GPR are unaffected by common but challenging road conditions like snow, heavy rain, fog, or poor lane markings.