Vehicles with Blind Spot Assist: Cross Traffic Alert can warn drivers of any crossing traffic when reversing out of a parking space. The radar sensors in the bumper also monitor the area adjacent to the vehicle. If a critical situation is detected, symbol 
appears in the media display. If the driver does not respond to the warning, the vehicle's brakes can be applied automatically.
If the radar sensors are obstructed by vehicles or other objects, detection is not possible.
if Blind Spot Assist is activated.
if the vehicle is reversing at walking pace.
If the manoeuvring assistant function is activated in the multimedia system.
Cross Traffic Alert is not available on inclines.
Cross Traffic Alert is not available when driving with a trailer.
Also observe the system limits of Active Blind Spot Assist More.