194 Driving and operatingIn the following cases, forwardcollision alert may not detect a vehicleahead or sensor performance may belimited:● on winding roads● when weather limits visibility,e.g. fog, rain, or snow● when the sensor is blocked bysnow, ice, slush, mud, dirt, orwindscreen damageFollowing distanceindicationThe following distance indicationdisplays the distance to a precedingmoving vehicle. The system uses,depending on the vehicle equipment,either the radar behind the radiatorgrille or the front camera in thewindscreen to detect the distance ofa vehicle directly ahead in your lane.It is active at speeds above 25 mph.When a preceding vehicle is detectedahead, the distance is indicated inseconds, displayed on a page in theDriver Information Centre 3 110.On Baselevel display set SettingsX with the Menu button and selectFollowing distance indication via theadjuster wheel on the turn signal lever3 110.On Midlevel or Uplevel display, selectInfo menu and press o to selectFollowing distance indication 3 110.The minimum indicated distance is0.5 seconds.If there is no vehicle ahead or thevehicle ahead is out of range, twodashes will be displayed: -.- s.If Adaptive cruise control is active,this page shows the followingdistance setting instead 3 183.Active emergency brakingActive emergency braking can help toreduce the damage from crashes withvehicles and obstacles directlyahead, when a collision can no longerbe avoided either by manual brakingor by steering. Before the activeemergency braking applies, the driveris warned by the forward collisionalert 3 190.The feature uses various inputs (e.g.radar sensor, brake pressure, vehiclespeed) to calculate the probability ofa frontal collision.Active emergency braking operatesautomatically above walking speed,provided that Auto CollisionPreparation setting is not deactivatedin the vehicle personalisation menu3 121.The system includes:● brake preparation system● emergency automatic braking● forward looking brake assist
