Driving and operating 201If there is no vehicle ahead or thevehicle ahead is out of range, twodashes will be displayed: -.- sec.If Adaptive cruise control is active,this page shows the alert sensitivitysetting instead of following distancesetting. 3 189.System limitationsIn the following cases, followingdistance indication sensorperformance is limited:● Driving on winding or hilly roads.● During nighttime driving.● Weather limits visibility, such asfog, rain, or snow.● The sensor is blocked by snow,ice, slush, mud, dirt, windscreendamage or affected by foreignitems, e.g. stickers.Active emergency brakingActive emergency braking can help toreduce the damage and injury fromcrashes with vehicles, pedestriansand obstacles directly ahead, when acollision can no longer be avoidedeither by manual braking or bysteering. Before the activeemergency braking applies, the driveris warned by the Forward collisionalert 3 197 or the Front pedestrianprotection alert 3 204.The feature uses various inputs (e.g.camera sensor, radar sensor, brakepressure, vehicle speed) to calculatethe probability of a frontal collision.9 WarningThis system is not intended toreplace the driver responsibility fordriving the vehicle and lookingahead. Its function is limited tosupplemental use only to reducethe vehicle speed before acollision.The system may not react toanimals. After a sudden lanechange, the system needs acertain time to detect the nextpreceding vehicle.The driver must always be readyto take action and apply the brakesand steer to avoid collisions.FunctionalityIf equipped only with front camera theactive emergency braking operates inforward gear above walking speed upto 53 mph.With radar sensor active emergencybraking operates in forward gearabove walking speed at all speeds.
