Building maps for a self-driving car
medium.com
medium.com
GPS accuracy is terrible, and I can only imagine that lane markings (where they even exist) are only slightly better. Even Tesla uses knowledge from other cars that drove through an area to refine its internal map.
Feel free to attack me on Twitter or Reddit or something.
It is just a logical conclusion reading your comment history.
Maybe you should check for your own logical errors before criticizing others?