Vehicles in front travelling out of lineVehicles in front travelling out of line - System limitations - Adaptive cruise control (ACC) - Controls - Audi A4 Owner's Manual - Audi A4

The vehicle in front is outside the range of the radar sensor

The vehicle in front is outside the range of the radar sensor

Vehicles in front which are not in line with your vehicle cannot be detected by the ACC system until they are within the range of the sensor.