This is how it works: Pre-Crash utilises the sensors of the Side Assist system, which during overtaking provides within the limits of its capabilities a warning of any vehicle in the 'blind spot'. Via radar sensors Side Assist is able to register the position and speed of the cars behind the Arteon. This data is then analysed by the Pre-Crash system. It does this not only when the car is moving, but also when it is stopped with the engine running and in stop-start mode, e.g. at the aforementioned red light. If the detected vehicle moves towards the Arteon, the system uses the position and speed of both cars to determine the probability of a possible collision. If the new Pre-Crash system detects an imminent risk, it duly reacts.
The hazard warning lights come on displaying the rear emergency collision alert signal and the system simultaneously closes all windows (except for a narrow gap that improves the bracing effect of the front head airbags) and the sliding sunroof. In parallel with this the belt tensioners pull the front safety belts taut.