148 Driving and operatingImportant hints for using theparking assist systems9 WarningUnder certain circumstances,various reflective surfaces onobjects or clothing as well asexternal noise sources may causethe system to fail to detectobstacles.CautionPerformance of the sensor can bereduced when sensors arecovered, e.g. by ice or snow.Performance of the parking assistsystems can be reduced by a levelchange of the sensors due toheavy loading.Special conditions apply if thereare taller vehicles involved (e.g.off-road vehicles, mini vans,vans). Object identification in theupper part of the vehicle cannot beguaranteed.Objects with a very small reflectioncross section, like objects ofnarrow size or soft materials, maynot be detected by the system.Parking assist systems are noteffective in assisting drivers inavoiding a collision withunexpected objects.NoticeThe parking assist systemautomatically detects factory-fittedtowing equipment. It is deactivatedwhen the connector is plugged in.Sensors could detect a non-existentobject (echo disturbance) caused byexternal acoustical or mechanicdisturbances.Advanced parking aid system maynot respond to changes in the parkingspace after initiating a parallel parkingmanoeuvre.Lane departure warningThe lane departure warning systemobserves the lane markings in whichthe vehicle is driving via a frontcamera. The system detects lanechanges and warns the driver in theevent of an unintended lane changevia visual and acoustic signals.Criteria for the detection of anunintended lane change include:■ no operation of turn signals■ no brake pedal operation
