DRIVER SUPPORT
* Option/accessory.
246
Road Sign Information* (RSI) -
limitations
The Road Sign Information (RSI32) function may
have limitations in certain situations.
The camera sensor for RSI has limitations just
like the human eye. Find out more about this in
the section on the camera sensor limitations
(p. 235).
Signs which indirectly provide information on a
prevailing speed limit, e.g. name signs for towns/
districts, are not recorded by RSI.
Examples of factors that can reduce RSI are as
follows:
•Faded signs
•Signs positioned on bends
•Rotated or damaged signs
•Signs positioned high above the roadway
•Fully/partially obscured or poorly positioned
signs
•signs completely or partly covered with frost,
snow and/or dirt
•digital road maps33 are out-of-date, inaccu-
rate or have no speed information34.
Related information
•Road Sign Information* (RSI) (p. 243)
•Road Sign Information (RSI)* - operation
(p. 244)
Driver Alert System*
The Driver Alert System is intended to assist dri-
vers whose driving ability is deteriorating or who
are inadvertently leaving the lane they are driving
on.
The Driver Alert System consists of different
functions which can either be switched on at the
same time or individually:
•Driver Alert Control - DAC (p. 248).
•Lane Keeping Aid (p. 252).
A switched-on function is set in standby mode
and is not activated automatically until speed
exceeds 65 km/h (40 mph).
The function is deactivated again when speed
decreases to below 60 km/h (37 mph).
The functions use a camera which is dependent
on the lane having side markings painted on
each side.
WARNING
Driver Alert System does not work in all situa-
tions but is designed merely as a supplemen-
tary aid.
The driver always bears ultimate responsibility
for ensuring that the vehicle is driven safely.
32 Road Sign Information
33 In cars equipped with Sensus Navigation.
34 Map data with speed information does not exist for all areas.
