Kia Cee'd: Lane departure warning system (LDWS) / The LDWS may not warn you even if the vehicle leaves the lane, or may warn you even if the vehicle does not leave the lane when

• The lane is not visible due to snow, rain, stain, a puddle or many other things.
• The brightness of the outside changes suddenly.
• Not turning on the headlight even at night or in the tunnel.
• Difficult to distinguish the color of the lane from the road.
• Driving on a steep grade or a curve.
• Light reflects from the water on the road.
• The lens or windshield is stained with foreign matter.
• The sensor can not detect the lane because of fog, heavy rain or heavy snow.
• The surrounding temperature of the inside rear view mirror is high due to a direct ray of light.
• The lane is very wide or narrow.
• The lane line is damaged or indistinct.
• The shadow is on the lane line by a median strip.
• There is a mark similar to a lane line.
• There is a boundary structure.
• The distance from vehicle ahead is very short or the vehicle ahead hides the lane line.
• The vehicle shakes heavily.
• The lane number increases or decreases or the lane lines are crossing complicatedly.
• Putting something on the dashboard.
• Driving with the sun in front of you.
• Driving in areas under construction.
• The lane line is more than two in either side (Left/Right).