― Poor vehicle lane line visibility due to adverse weather (rain, snow, fog)
― Poor vehicle lane line visibility due to backlight, snow on the road, water puddles, road ruts
― Poor vehicle lane line visibility due to cracks and fissures in the vehicle lane
― Vehicle lane lines intersect with complexity due to additions or reductions of driving lanes
― Vehicle lane marking is not completely erased after road maintenance, two or more lane lines next to each other
― Vehicle lane lines not recognized due to vehicle ahead