BMW 550i Sedan 2008 - Manual (Page 109)

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If you activate the system below a speed of
approx. 40 mph/70 km/h, a message will appear
stating that the system is not active until this
speed is reached.
A warning will be canceled:
> after approx. 3 seconds
> if you return to your lane
> if you brake heavily
> if you signal
System limits
The leaving lane warning cannot serve as
a substitute for your personal judgment in
determining the course of the road.
If the system issues a warning, do not move the
steering wheel with unnecessary severity, as
otherwise you could loose control of the vehi-
cle.
<
The function of the system may be limited in the
following example situations:
> in heavy fog, rain or snowfall
> with worn-away, poorly visible limit lines, or
lines that run together or apart or are
unclear, e.g. in road construction areas
> when limit lines are covered by snow, ice,
dirt or a great deal of water
> in tight curves or on narrow roads
> when limit lines are not white
> when limit lines are covered by objects
> when driving up close behind a vehicle driv-
ing ahead
> with bright counter light
> when the windshield is fogged up, dirty or
covered with stickers, vignettes etc. in the
area of the inside rearview mirror
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