Mercedes-Benz 2011 E-Class Sedan Operator's Manual page 216

Driving systems
214
Active Lane Keeping Assist does not detect
road and traffic conditions. An inappropriate
brake application may be interrupted at any
time if you:
steer slightly in the opposite direction
R
use a turn signal
R
clearly brake or accelerate
R
A lane-correcting brake application is
interrupted automatically if:
a driving safety system intervenes, such as
R
®
ESP , PRE-SAFE
Spot Assist
lane markings can no longer be recognized
R
Activating Active Lane Keeping Assist
X
Activate Active Lane Keeping Assist using
the on-board computer (
Symbol : appears in the multifunction
display.
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
symbol : is highlighted. Active Lane Keeping
Assist is ready for use.
®
Brake or Active Blind
Y page 229).