This backfires badly in places with cold winter climates where the offical road markings and edges become obscured due to snow and ice for days and sometimes se

This backfires badly in places with cold winter climates where the offical road markings and edges become obscured due to snow and ice for days and sometimes seasons (road edge creep) at a time. Human drivers don't follow the official lane markings because they can't be seen. They follow the paths in the snow everyone else has packed down. These paths often diverge from the road markings or any sort of absolute positioning system.