it is the gps maps that they have. sensors that they have on the cars to make sure there is no one standing in front of them. in some instances it's the ability for a camera on the car to be able to see the white lines that tell you whether or not you are in the lane or need to stay in the lane or if it's a yellow line with oncoming traffic. >> bill: the way i understood it best there is a rainstorm coming into the washington, d.c. area. the signs on the highway would reduce the speed 10 miles an hour after each occurring sign. >> right. >> which prevented any traffic gumming up the works when the storm rolled through. the thinking is you could take that simple technology and communicate it to a smart car at some point to control the pace of traffic in a storm that i just mentioned there. >> exactly. what you are basically doing. the best way to look at these driverless cars and smart roads is you are turning a car into a data point. it becomes a 1 or 0, on a map