When lane and road condition is poor

• It is difficult to distinguish the lane marker from road when the lane marker is covered with dust or sand.

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

• There is something that looks like a lane marker.

• The lane marker is indistinct or damaged.

• The number of lanes increases/decreases or the lane lines are crossing (Driving through a toll plaza / toll gate, merged/divided lane).

• There are more than two lane markers.

• The lane marker is very thick or thin.

• The lane marker is not visible due to snow, rain, stain, a puddle or other factors.

• A shadow is on the lane marker because of a median strip, guardrail, noise barriers or other objects.

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

• There are crosswalk signs or other symbols on the road.

• The lane suddenly disappears such as at the intersection.

• The lane marker in a tunnel is covered with dirt or oil and etc.

When external conditions intervene

• The brightness outside changes suddenly when entering/exiting a tunnel or passing under a bridge.

• The headlamps are not on at night or in a tunnel, or light level is low.

• There is a boundary structure in the roadway.

• The light reflects from the water on the road.

• When light shines brightly from behind the vehicle.

• The distance from the vehicle ahead is very short or the vehicle ahead covers up the lane line.

• You drive on a steep grade or a sharp curve.

• The vehicle vibrates heavily.

• The temperature near the rearview mirror is very high due to direct sun light and etc.

When front visibility is poor

• The lens or windshield is covered by foreign materials.

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

• The windshield is fogged by humid air in the vehicle.