Depending on vehicle equipment, Active Emergency Stop Assist uses touch sensors or detects steering movements when monitoring the steering wheel. If the system detects that the driver is no longer holding the steering wheel, it can initiate an emergency stop, if necessary.
Vehicles without Driving Assistance Package: the accelerator and brake pedal are monitored as well as the steering wheel.
Vehicles with Driving Assistance Package: if Active Steering Assist is deactivated, the accelerator and brake pedal are monitored as well as the steering wheel.
A warning is issued when the steering wheel is not being held or when a pedal is not depressed, and the vehicle is in danger of leaving the lane.
If the system detects that the driver has not steered the vehicle for a considerable period of time or has removed their hands from the steering wheel, visual warning 
is issued. If the driver still does not steer the vehicle, or gives no confirmation to the system, a warning tone sounds in addition to the visual warning message.
Also observe the instructions on the contact detection of Active Steering Assist More.
Display message
appears in the driver's display. In addition to display
a warning tone sounds. The Beginning emergency stop message appears in the driver's display, a continuous warning tone sounds, the vehicle no longer accelerates, and there is a slight, repeated tensioning of the seat belt.
The vehicle speed is reduced in increments until it is at a standstill. Sharp brake impulses are also produced.
Vehicles with Driving Assistance Package: depending on the country, a lane change to the adjacent right-hand lane is carried out, if possible.
It is only possible to change across one lane and only into the right-hand lane, and not onto the hard shoulder.
When automatic braking is initiated, Active Distance Assist DISTRONIC is deactivated. Depending on the country, the hazard warning light system is switched on.
The vehicle is secured with the electric parking brake.
The vehicle is unlocked.
If possible, an emergency call is placed to the Mercedes-Benz emergency call centre.
Before automatic braking is initiated, you can cancel Active Emergency Stop Assist by steering.
Accelerating or braking: the emergency stop is cancelled, but the warning message, warning tone and power steering remain active
Steering: power-assisted steering is cancelled, the warning message and warning tone remain active and the vehicle continues to be braked
Active Emergency Stop Assist can initiate an emergency stop a maximum of three times within one driving cycle. Subsequently, Active Steering Assist and Active Emergency Stop Assist are deactivated for that driving cycle.
Vehicles without Driving Assistance Package: if Active Lane Keeping Assist does not detect lane markings or is deactivated, Active Emergency Stop Assist is not active.
Vehicles with Driving Assistance Package: if Active Lane Keeping Assist does not detect lane markings, Active Emergency Stop Assist is not active.