Cross Traffic Alert*

CTA1 is a driver support that supplements BLIS2 and is designed to help the driver detect traffic crossing behind the car when it is reversing.

P5-1507-CrossTrafficAlert Princip
Principle of CTA.

CTA supplements BLIS by detecting the approach of crossing traffic during reversing, such as when reversing out of a parking space.

CTA is primarily designed to detect vehicles. In favourable conditions it may also be able to detect smaller objects, such as cyclists and pedestrians.

CTA is only active if the car rolls backwards or if reverse gear has been selected.

If CTA senses that something is approaching from the side, this is also indicated with:
  • an acoustic signal - the sound is heard in the left-hand or right-hand speaker according to the direction from which the object approaches.
  • an illuminated icon in the PAS3 graphic on the screen.
  • an icon on the Park assist camera top view.
P5-1646-CrossTrafficAlert Screen symbol
Illuminated icon for CTA in the PAS3 graphic on the screen4.


  • The Cross Traffic Alert function is supplementary driver support intended to facilitate driving and make it safer – it cannot handle all situations in all traffic, weather and road conditions.
  • The responsibility for reversing the car safely and using good judgement always rests with the driver.
  • Cross Traffic Alert is not a substitute for the driver's attention and judgement. The driver is always responsible for ensuring the car is driven in a safe manner, at the appropriate speed, with an appropriate distance to other vehicles, and in accordance with current traffic rules and regulations.
  1. * Option/accessory.
  2. 1 Cross Traffic Alert
  3. 2 Blind Spot Information
  4. 3 Park Assist System: Parking assistance system with reversing sensors
  5. 4 NOTE: The illustration is schematic - details may vary depending on car model.