It is difficult to distinguish the lane marking from the road surface of the lane marking is faded or not clearly marked.

It is difficult to distinguish the color of the lane marker from the road.

There are markings on the road surface that look like a lane marker that is inadvertently being detected by the camera.

The lane marker is indistinct or damaged.

The lane marker is merged or divided. (e.g. tollgate)

The lane number increases or decreases or the lane marker are crossing complicatedly.

There are more than two lane markers on the road in front of you.

Then lane marker is very thick of thin.

The lane marker ahead is not visible due to rain, snow, water on the road, damaged or stained road surface, or other factors.

The shadow is on the lane marker by a median strip, trees, guardrail, noise barriers, etc.

The lane markers are complicated or a structure substitutes for the lines such as a construction area.

There are crosswalk sign or other symbols on the road.

The lane suddenly disappears such as at the intersection.

The brightness outside changes suddenly such as when entering or exiting a tunnel, or when passing under a bridge.

The brightness outside is too low such as when the headlamps are not on at night or the vehicle is going through a tunnel.

There is a boundary structure in the roadway such as a concrete barrier, guardrail and reflector post that is inadvertently being detected by the camera.

When light coming from a street light or an oncoming vehicle is reflected on a wet road surface such as a puddle in the road.

The field of view in front is obstructed by sun glare.

There is not enough distance between you and the vehicle in front to be able to detect the lane marker or the vehicle ahead is driving on the lane marker.

Driving on a steep grade, over a hill, or when driving on a curved road.

The adverse road conditions cause excessive vehicle vibrations while driving.

The surrounding of the inside rear view mirror temperature is high due to direct sunlight, etc.

The windshield or the camera lens is blocked with dirt or debris.

The windshield glass is fogged up; a clear view of the road is obstructed.

Placing objects on the dashboard, etc.

The sensor cannot detect the lane because of fog, heavy rain or snow.