Sight is the distance the driver that can see in front of the lane when driving the vehicle forward. Distance and view of the driver are extremely important for safety purpose, especially for fast driving on the road. The choice of speed and driving directions depends on the driver’s ability to see the road ahead and the surroundings, with sufficient line-of-sight limits for early detection for oncoming vehicles and obstacles on the road, the timely adjustment of speed or lane change, to ensure that in an emergency can immediately stop and avoid danger. Therefore, a sufficient line of sight and wide field of vision is to ensure the safety of road traffic the main factor. Using traffic markings to improve line-of-sight is a common safety measure.