Lane-level navigation is a high-precision navigation technology. It can display the road conditions in more detail, including the number of lanes, ground markings, entrances and exits, special lanes and so on. , and display the user's lane position in real time. This means that the navigation content will change from a simple "turn left, turn right, go straight 100 meters and turn around" to "Please change lanes to the right and enter the right lane, and turn right 50 meters ahead". Lane-level navigation is usually not displayed in normal navigation in the city, but only in complex areas such as urban ring roads and expressway exits. Through lane-level navigation, users can effectively reduce illegal operations when driving, and can effectively reduce detours caused by exit errors in the import and export scenes of high-speed and fast sections. The advantage of lane-level navigation lies in navigating a higher atlas, and adopting high-definition rendering technology to restore the real road scene to the greatest extent, including some special passages, as well as the number of lanes and the ground of the current road. Signs, markings, and high-speed entrances and exits make the road conditions clear at a glance, making it easier to travel by car without worrying about going the wrong way or missing the fork in the road.