2011 Mercedes S-Class Owner's Manual - Page 361

Driving systems Active Lane Keeping Assist Important safety notes Active Lane Keeping Assist monitors the area in front of your vehicle by means of a camera at the top of the windshield. Active Lane Keeping Assist detects lane markings on the road and warns you before you leave your lane unintentionally. If you do not react to the warning, a lane-correcting application of the brakes can bring the vehicle back into the original lane. Rthe 359 : Active Lane Keeping Assist camera If you select km on the on-board computer in the Display Unit Speed-/ Odometer (Y page 377) function, Active Lane Keeping Assist is activated starting at a speed of 60 km/h. If the mph display unit is selected, the assistance range begins at 40 mph. windshield is dirty, fogged up or covered, for instance by a sticker, in the vicinity of the camera. Rthe lane markings are worn away, dark or covered up, e.g. by dirt or snow. Rthe distance to the vehicle in front is too small and the lane markings thus cannot be detected. Rthe lane markings on the road are unclear, e.g. near roadworks. Rthe lane markings change quickly, e.g. lanes branch off, cross one another or merge. Rthe road is narrow and winding. Active Lane Keeping Assist cannot detect road and traffic conditions. It is not a substitute for attentive driving. You are responsible for the vehicle's speed, braking in good time, and steering correctly. Always adapt your driving style to suit the prevailing road and weather conditions. Always pay attention to traffic conditions and your surroundings. Otherwise, you may fail to recognize dangers in time, cause an accident and injure yourself and others. G Warning Active Lane Keeping Assist does not keep your vehicle in its lane. It is only an aid and may detect the lane markings on the road incorrectly or not at all. The system may be impaired or may not function if: Rseveral or no lane markings for a single lane Warning vibration in the steering wheel A warning can be given when a front wheel passes over a lane marking. It will warn you by means of intermittent vibration in the steering wheel for up to 1.5 seconds. In order that you are warned only when necessary and in good time if you cross the lane marking, the system recognizes certain conditions and warns you accordingly. The warning vibration occurs earlier if: Ryou are present. is poor visibility, e.g. due to insufficient illumination of the road, or due to snow, rain, fog or spray. Rthere is glare, e.g. from oncoming traffic, the sun, or reflection from other vehicles. Rthere approach the outer lane marking on a bend. Rthe road has very wide lanes, e.g. a freeway. Rthe system recognizes solid lane markings. The warning vibration occurs later if: Rthe Ryou road has narrow lanes. cut the corner on a bend. Z Driving and parking