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208 Driving systems<br />
Driving and parking<br />
The system may be impaired or may not<br />
function if:<br />
Rthere is poor visibility, e.g. due to<br />
insufficient illumination of the road, or due<br />
to snow, rain, fog or spray.<br />
Rthere is glare, e.g. from oncoming traffic,<br />
the sun, or reflection from other vehicles.<br />
Rthe windshield is dirty, fogged up or<br />
covered, for instance by a sticker, in the<br />
vicinity of the camera.<br />
Rseveral or no lane markings for a single lane<br />
are present.<br />
Rthe lane markings are worn away, dark or<br />
covered up, e.g. by dirt or snow.<br />
Rthe distance to the vehicle in front is too<br />
small and the lane markings thus cannot be<br />
detected.<br />
Rthe lane markings on the road are unclear,<br />
e.g. near roadworks.<br />
Rthe lane markings change quickly, e.g.<br />
lanes branch off, cross one another or<br />
merge.<br />
Rthe road is narrow and winding.<br />
Lane Keeping Assist cannot detect road and<br />
traffic conditions. It is not a substitute for<br />
attentive driving. You are responsible for the<br />
vehicle's speed, braking in good time, and<br />
steering correctly. Always adapt your driving<br />
style to suit the prevailing road and weather<br />
conditions. Always pay attention to traffic<br />
conditions and your surroundings. Otherwise,<br />
you may fail to recognize dangers in time,<br />
cause an accident and injure yourself and<br />
others.<br />
A warning can be given when a front wheel<br />
passes over a lane marking. It will warn you<br />
by means of intermittent vibration in the<br />
steering wheel for up to 1.5 seconds.<br />
In order that you are warned only when<br />
necessary and in good time if you cross the<br />
lane marking, the system recognizes certain<br />
conditions and warns you accordingly.<br />
The warning vibration occurs earlier if:<br />
Ryou approach the outer lane marking on a<br />
bend.<br />
Rthe road has very wide lanes, e.g. a<br />
freeway.<br />
Rthe system recognizes solid lane markings.<br />
The warning vibration occurs later if:<br />
Rthe road has narrow lanes.<br />
Ryou cut the corner on a bend.<br />
No warning vibration occurs if:<br />
Ryou clearly and actively steer, brake, or<br />
accelerate.<br />
Ryou cut the corner on a sharp bend.<br />
Ra driving safety system intervenes, such as<br />
ABS, BAS or ESP ® .<br />
Ryou switch on the turn signals. In this event,<br />
the warnings are suppressed for a certain<br />
period of time.<br />
Activating Lane Keeping Assist<br />
X Activate Lane Keeping Assist using the onboard<br />
computer (Y page 229).<br />
Symbol : appears in the multifunction<br />
display.<br />
If you drive at speeds above 40 mph<br />
(60 km/h) and lane markings are detected,<br />
symbol : is highlighted. Lane Keeping<br />
Assist is ready for use.<br />
Active Driving Assistance package<br />
General information<br />
The Active Driving Assistance package<br />
consists of DISTRONIC PLUS (Y page 179),<br />
Active Blind Spot Assist (Y page 209) and<br />
Active Lane Keeping Assist (Y page 211).